chore(repo-server): unify semver resolution in new versions subpackage

[PaulSonOfLars]

Unify semver resolution across helm/OCI/git into a single package, to ensure we don't end up with mismatched logic for different services

Follow up to #20096, as requested here. cc @blakepettersson

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• The title of the PR conforms to the Toolchain Guide
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• I have signed off all my commits as required by DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My build is green (troubleshooting builds).
• My new feature complies with the feature status guidelines.
• I have added a brief description of why this PR is necessary and/or what this PR solves.
• Optional. My organization is added to USERS.md.
• Optional. For bug fixes, I've indicated what older releases this fix should be cherry-picked into (this may or may not happen depending on risk/complexity).

[bunnyshell]

✅ Preview Environment deployed on Bunnyshell

Component	Endpoints
argocd	https://argocd-4ej5vm.bunnyenv.com/
argocd-ttyd	https://argocd-web-cli-4ej5vm.bunnyenv.com/

See: Environment Details | Pipeline Logs

Available commands (reply to this comment):

• 🔴 /bns:stop to stop the environment
• 🚀 /bns:deploy to redeploy the environment
• ❌ /bns:delete to remove the environment

[bunnyshell]

✅ Preview Environment created on Bunnyshell but will not be auto-deployed

See: Environment Details

Available commands (reply to this comment):

• 🚀 /bns:deploy to deploy the environment

[blakepettersson]

This is looking good so far! Just a few minor comments

[blakepettersson]

I think you also need to run make mockgen