Add github actions to aid the release process

[shaynafinocchiaro]

Is this a new chart?

No

What this PR does / why we need it:

This PR adds 2 additional github actions

• Post Release Action updates references of target-branch, mostly for dependabot
• Sync Release Branch with Main will try to rebase the feature branch with main when there are pushes to main branch. If a rebase can't be performed automatically, an issue is created and assigned to the person who last merged to main. This is done in hopes to ease the release of the helm-charts.

Which issue(s) is this PR associated with:

• [FEATURE]: Automate the release process for CSM products csm#1490

Special notes for your reviewer:

Checklist:

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• Chart Version bumped
• Variables are documented in the chart README.md
• Title of the PR starts with the chart name (e.g. [charts_dir/mychartname]) if applicable
  
  

[ChristianAtDell]

This is an impressive bit of work that could make releases faster/more automated. Has it been tested in a private clone of the repository to make sure it creates the proper branch? Does it do any tagging? I didn't see actions for that but I figure that's the next logical step.

[shaynafinocchiaro]

This is an impressive bit of work that could make releases faster/more automated. Has it been tested in a private clone of the repository to make sure it creates the proper branch? Does it do any tagging? I didn't see actions for that but I figure that's the next logical step.

@ChristianAtDell I did all the testing in a forked repo. I'll attach screenshots to the PR description. These actions don't do any releasing. That's already handled by https://github.com/dell/helm-charts/blob/main/.github/workflows/charts-release-action.yml and https://github.com/dell/helm-charts/blob/main/.github/workflows/wizard-release-action.yml. This is mainly to prevent having to rebase a ton of changes at the end of the release since there's a lot of room for human error.

[tdawe]

LGTM