Helm Changes and OpenShift Support

[v0lkan]

Title of the Pull Request

Helm Changes and OpenShift Support

This PR introduces necessary changes to align VSecM SPIRE charts with the official helm-charts-hardened SPIFFE charts; adds necessary changes to enable OpenShift support, and revamps current SPIRE helm charts.

I will annotate important changes as usual.

Changes

• The Entire ./spire folder in the helm charts template has been rewritten.
• Necessary code changes to make the new charts work.
• CRD updates.
• ClusterSPIFFEID changes. Most significantly, ClusterSPIFFEIDs now have a className field.
• Removed bundle endpoint from the charts; we are not doing federation, so we don't immediately need it right now.

Test Policy Compliance

• I have added or updated unit tests for my changes.
• I have included integration tests where applicable.
• All new and existing tests pass successfully.

Code Quality

• I have followed the coding standards for this project.
• I have performed a self-review of my code.
• My code is well-commented, particularly in areas that may be difficult
  to understand.

Documentation

We may need to update documentation and add instructions for OpenShift. I’ll do that separately.

Checklist

Before you submit this PR, please make sure:

• You have read the contributing guidelines and
  especially the test policy.
• You have thoroughly tested your changes.
• You have followed all the contributing guidelines for this project.
• You understand and agree that your contributions will be publicly available
  under the project's license.

By submitting this pull request, you confirm that my contribution is made under
the terms of the project's license and that you have the authority to grant
these rights.

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Thank you for your contribution to VMware Secrets Manager
🐢⚡️!

[v0lkan]

This className is important because that’s how SPIRE manages its internal ClusterSPIFFEIDs too.