[FEAT]: Add resources to customize OIDC subject claims

[F21]

Describe the need

I would like to be able to customize OICD subject claims for GitHub actions on a per-repo or per-organization basis.
This can be accomplished via the API, but it would be really great if we can do this in Terraform too.

Docs: https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/about-security-hardening-with-openid-connect#customizing-the-subject-claims-for-an-organization-or-repository
API: https://docs.github.com/en/rest/actions/oidc#set-the-customization-template-for-an-oidc-subject-claim-for-a-repository

SDK Version

No response

API Version

No response

Relevant log output

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Code of Conduct

• I agree to follow this project's Code of Conduct

[kfcampbell]

@F21 I agree this would be a nice feature! Do you have any interest in opening up a PR for this behavior?

[F21]

@kfcampbell Sure! Definitely happy to open a PR for this, but we need to get this supported in google/go-github first, so I logged google/go-github#2614

[kfcampbell]

@F21 thank you! You rock.

[F21]

This can be implemented once google/go-github#2615 is merged.