fix(go): ensure deterministic ordering in generated requests.go and requests_test.go

[developerkunal]

Description

Fix non-deterministic ordering in Go SDK generator output. Go maps randomize iteration order by design, so when the IR JSON is deserialized into Go maps, the insertion order is lost. This causes requests.go, requests_test.go, and other generated files to have different type orderings across runs — producing noisy PR diffs.

Changes Made

• Added sortedMapKeys and sortedFileInfoKeys generic helpers using slices.SortFunc/cmp.Compare to extract and sort map keys before iteration
• Applied sorted iteration to 12 map range loops in generators/go/internal/generator/generator.go that were iterating Go maps non-deterministically
• Created a new go-deterministic-ordering Go-only test fixture with duplicate endpoint names (create, get, list) across 3 services to reproduce and prevent regression
• Added ir-to-jsonschema snapshots and IR test definitions for the new fixture
• Bumped version to 1.29.2 in generators/go/sdk/versions.yml

Testing

• Unit tests added/updated — existing Go generator tests pass (go test ./...)
• Manual testing completed:
  • Verified bug reproduces without fix (unfixed code shows request types swapping order across runs)
  • Verified fix produces deterministic output (10 consecutive seed runs, zero diffs)
  • Verified no regressions across all exhaustive fixtures (3/3) and examples fixtures (10/10)

[github-actions]

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[Copilot]

Pull request overview

Fixes non-deterministic ordering in the Go SDK generator output by sorting map keys prior to iteration, reducing noisy diffs in generated Go files.

Changes:

• Adds sorted key iteration helpers and applies them across map range loops in the Go generator to make generation deterministic.
• Introduces a new Go-only fixture (go-deterministic-ordering) to reproduce and prevent regressions for ordering issues.
• Bumps the Go generator version to 1.29.2 and adds/updates related snapshots.

Reviewed changes

Copilot reviewed 182 out of 229 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
generators/go/sdk/versions.yml	Version bump to 1.29.2 documenting the deterministic-ordering fix.
seed/go-sdk/go-deterministic-ordering/go.mod	Adds a Go module for the new deterministic-ordering fixture.
seed/go-sdk/go-deterministic-ordering/.github/workflows/ci.yml	Adds fixture-local CI workflow for build/lint/test.
seed/go-sdk/go-deterministic-ordering/internal/error_decoder.go	Adds an error decoder utility used by generated clients.
seed/go-sdk/go-deterministic-ordering/internal/error_decoder_test.go	Adds unit tests for the error decoder behavior.
seed/go-sdk/go-deterministic-ordering/internal/extra_properties.go	Adds helper for extracting/marshaling extra JSON properties.
seed/go-sdk/go-deterministic-ordering/**	Adds generated Go SDK + wiremock tests + dynamic snippets for the new fixture.
packages/cli/fern-definition/ir-to-jsonschema/src/test/snapshots/go-deterministic-ordering/**	Adds JSON schema snapshots for the new fixture/types.

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