github: Add common-instancetypes-version annotation during release

[lyarwood]

What this PR does / why we need it:

Tested on my personal repo with the following release tag and action run:

https://github.com/lyarwood/common-instancetypes/releases/tag/v1.2.3

https://github.com/lyarwood/common-instancetypes/actions/runs/5280248830

This produces the following release bundle with the correct annotation:

$ curl -LJ https://github.com/lyarwood/common-instancetypes/releases/download/v1.2.3/common-clusterinstancetypes-bundle-v1.2.3.yaml | yq '.metadata.name,.metadata.annotations | with_entries(select(.key == "instancetype.kubevirt.io/common-instancetypes-version"))' common-clusterinstancetypes-bundle-v1.2.3.yaml
[..]
cx1.4xlarge
---
instancetype.kubevirt.io/common-instancetypes-version: v1.2.3
---
cx1.8xlarge
---
instancetype.kubevirt.io/common-instancetypes-version: v1.2.3
---
cx1.large
---
instancetype.kubevirt.io/common-instancetypes-version: v1.2.3
---
cx1.medium
---
instancetype.kubevirt.io/common-instancetypes-version: v1.2.3
---
cx1.xlarge
---
instancetype.kubevirt.io/common-instancetypes-version: v1.2.3
---
gn1.2xlarge
---
instancetype.kubevirt.io/common-instancetypes-version: v1.2.3
---
gn1.4xlarge
---
instancetype.kubevirt.io/common-instancetypes-version: v1.2.3
---
gn1.8xlarge
---
instancetype.kubevirt.io/common-instancetypes-version: v1.2.3
---
gn1.xlarge
---
instancetype.kubevirt.io/common-instancetypes-version: v1.2.3
---
highperformance.large
---
instancetype.kubevirt.io/common-instancetypes-version: v1.2.3
---
highperformance.medium
---
instancetype.kubevirt.io/common-instancetypes-version: v1.2.3
---
highperformance.small
---
instancetype.kubevirt.io/common-instancetypes-version: v1.2.3
---
m1.2xlarge
---
instancetype.kubevirt.io/common-instancetypes-version: v1.2.3
---
m1.4xlarge
---
instancetype.kubevirt.io/common-instancetypes-version: v1.2.3
[..]

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #53

Special notes for your reviewer:

Release note:

All released resources are now given a `instancetype.kubevirt.io/common-instancetypes-version` annotation denoting the release they are associated with.

[kubevirt-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[lyarwood]

This needs to run against the generated files, not only the files we import into SSP.

[ksimon1]

/lgtm

[0xFelix]

Thanks!

/approve
/lgtm

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 0xFelix

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