[MAINT]: Add a new resource for `github_repository_vulnerability_alerts`

[deiga]

Describe the need

#3024 (comment)

As the vulnerability alerts of a repository are a separate API it makes sense to separate their config from github_repository. Especially with the Enterprise and Organization policies that prevent certain configurations for vulnerability alerts it's going to be easier to maintain sensible defaults.

Since this is deprecating existing functionality we need to do the following steps:

• Create a new resource and data source github_repository_vulnerability_alerts
• [ ] Add a new field ignore_vulnerability_alerts to github_repository which disables any interactions with the vulnerability alerts API
• Mark the fields ignore_vulnerability_alerts_during_read and vulnerability_alerts as Deprecated in github_repository
• [MAINT]: Remove deprecated vulnerability_alerts fields from github_repository #3039

SDK Version

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API Version

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Relevant log output

Code of Conduct

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

[github-actions]

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