add istio classifier

[witchcraze]

Description

add istio classifier

$ go run cmd/syft/main.go -q istio/pilot:1.26.8 | grep -e 'istio' -e 'pilot'
istio.io/api                                      v1.26.7-0.20251203124221-04fd5ef0d3ca  go-module
istio.io/client-go                                v1.26.7-0.20251203124822-c46e19018717  go-module
istio.io/istio                                    v0.0.0-20251213104211-4ea27a1efd95     go-module
pilot-discovery                                   1.26.8                                 binary

$ go run cmd/syft/main.go -q istio/proxyv2:1.26.8 | grep -e 'istio' -e 'pilot'
istio.io/api                                      v1.26.7-0.20251203124221-04fd5ef0d3ca  go-module
istio.io/istio                                    v0.0.0-20251213104211-4ea27a1efd95     go-module
pilot-agent                                       1.26.8                                 binary

$ go test -v ./syft/pkg/cataloger/binary -run Test_Cataloger_PositiveCases/istio
=== RUN   Test_Cataloger_PositiveCases
=== RUN   Test_Cataloger_PositiveCases/istio_pilot-discovery/1.26.8/linux-amd64
    snippet_or_binary.go:50: using snippet for "istio_pilot-discovery/1.26.8/linux-amd64"
=== RUN   Test_Cataloger_PositiveCases/istio_pilot-discovery/1.8.0/linux-amd64
    snippet_or_binary.go:50: using snippet for "istio_pilot-discovery/1.8.0/linux-amd64"
=== RUN   Test_Cataloger_PositiveCases/istio_pilot-discovery/1.3.8/linux-amd64
    snippet_or_binary.go:50: using snippet for "istio_pilot-discovery/1.3.8/linux-amd64"
=== RUN   Test_Cataloger_PositiveCases/istio_pilot-discovery/1.1.17/linux-amd64
    snippet_or_binary.go:50: using snippet for "istio_pilot-discovery/1.1.17/linux-amd64"
=== RUN   Test_Cataloger_PositiveCases/istio_pilot-agent/1.26.8/linux-amd64
    snippet_or_binary.go:50: using snippet for "istio_pilot-agent/1.26.8/linux-amd64"
=== RUN   Test_Cataloger_PositiveCases/istio_pilot-agent/1.8.0/linux-amd64
    snippet_or_binary.go:50: using snippet for "istio_pilot-agent/1.8.0/linux-amd64"
=== RUN   Test_Cataloger_PositiveCases/istio_pilot-agent/1.1.17/linux-amd64
    snippet_or_binary.go:50: using snippet for "istio_pilot-agent/1.1.17/linux-amd64"
--- PASS: Test_Cataloger_PositiveCases (0.51s)
    --- PASS: Test_Cataloger_PositiveCases/istio_pilot-discovery/1.26.8/linux-amd64 (0.09s)
    --- PASS: Test_Cataloger_PositiveCases/istio_pilot-discovery/1.8.0/linux-amd64 (0.09s)
    --- PASS: Test_Cataloger_PositiveCases/istio_pilot-discovery/1.3.8/linux-amd64 (0.07s)
    --- PASS: Test_Cataloger_PositiveCases/istio_pilot-discovery/1.1.17/linux-amd64 (0.07s)
    --- PASS: Test_Cataloger_PositiveCases/istio_pilot-agent/1.26.8/linux-amd64 (0.05s)
    --- PASS: Test_Cataloger_PositiveCases/istio_pilot-agent/1.8.0/linux-amd64 (0.07s)
    --- PASS: Test_Cataloger_PositiveCases/istio_pilot-agent/1.1.17/linux-amd64 (0.06s)
PASS
ok      github.com/anchore/syft/syft/pkg/cataloger/binary       0.533s

$ go test -v ./syft/pkg/cataloger/binary -run Test_Cataloger_PositiveCases/istio -must-use-original-
binaries
=== RUN   Test_Cataloger_PositiveCases
=== RUN   Test_Cataloger_PositiveCases/istio_pilot-discovery/1.26.8/linux-amd64
    snippet_or_binary.go:62: forcing the use of the original binary for "istio_pilot-discovery/1.26.8/linux-amd64"
=== RUN   Test_Cataloger_PositiveCases/istio_pilot-discovery/1.8.0/linux-amd64
    snippet_or_binary.go:62: forcing the use of the original binary for "istio_pilot-discovery/1.8.0/linux-amd64"
=== RUN   Test_Cataloger_PositiveCases/istio_pilot-discovery/1.3.8/linux-amd64
    snippet_or_binary.go:62: forcing the use of the original binary for "istio_pilot-discovery/1.3.8/linux-amd64"
=== RUN   Test_Cataloger_PositiveCases/istio_pilot-discovery/1.1.17/linux-amd64
    snippet_or_binary.go:62: forcing the use of the original binary for "istio_pilot-discovery/1.1.17/linux-amd64"
=== RUN   Test_Cataloger_PositiveCases/istio_pilot-agent/1.26.8/linux-amd64
    snippet_or_binary.go:62: forcing the use of the original binary for "istio_pilot-agent/1.26.8/linux-amd64"
=== RUN   Test_Cataloger_PositiveCases/istio_pilot-agent/1.8.0/linux-amd64
    snippet_or_binary.go:62: forcing the use of the original binary for "istio_pilot-agent/1.8.0/linux-amd64"
=== RUN   Test_Cataloger_PositiveCases/istio_pilot-agent/1.1.17/linux-amd64
    snippet_or_binary.go:62: forcing the use of the original binary for "istio_pilot-agent/1.1.17/linux-amd64"
--- PASS: Test_Cataloger_PositiveCases (19.12s)
    --- PASS: Test_Cataloger_PositiveCases/istio_pilot-discovery/1.26.8/linux-amd64 (2.99s)
    --- PASS: Test_Cataloger_PositiveCases/istio_pilot-discovery/1.8.0/linux-amd64 (4.89s)
    --- PASS: Test_Cataloger_PositiveCases/istio_pilot-discovery/1.3.8/linux-amd64 (1.48s)
    --- PASS: Test_Cataloger_PositiveCases/istio_pilot-discovery/1.1.17/linux-amd64 (4.47s)
    --- PASS: Test_Cataloger_PositiveCases/istio_pilot-agent/1.26.8/linux-amd64 (0.76s)
    --- PASS: Test_Cataloger_PositiveCases/istio_pilot-agent/1.8.0/linux-amd64 (2.71s)
    --- PASS: Test_Cataloger_PositiveCases/istio_pilot-agent/1.1.17/linux-amd64 (1.80s)
PASS
ok      github.com/anchore/syft/syft/pkg/cataloger/binary       19.134s

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (please discuss with the team first; Syft is 1.0 software and we won't accept breaking changes without going to 2.0)
• Documentation (updates the documentation)
• Chore (improve the developer experience, fix a test flake, etc, without changing the visible behavior of Syft)
• Performance (make Syft run faster or use less memory, without changing visible behavior much)

Checklist

• I have added unit tests that cover changed behavior
• I have tested my code in common scenarios and confirmed there are no regressions
• I have added comments to my code, particularly in hard-to-understand sections

Issue references

Fixes #4508

[wagoodman]

@witchcraze can you rebase this? otherwise looks good 👍

[witchcraze]

Thank you.
I updated