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).

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[blakepettersson]

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

[blakepettersson]

I think you also need to run make mockgen

[PaulSonOfLars]

@blakepettersson thanks for the review!
I've reverted things back to entries and added in a private struct for the tags methods. Also fixed some tests which were failing due to new error messages. Let me know if you'd like me to poke at anything else!

[codecov]

Codecov Report

Attention: Patch coverage is 77.92208% with 17 lines in your changes missing coverage. Please review.

Project coverage is 55.21%. Comparing base (ec499bb) to head (3ca3a59).
Report is 19 commits behind head on master.

Files with missing lines	Patch %	Lines
util/helm/index.go	0.00%	6 Missing ⚠️
util/versions/tags.go	82.35%	4 Missing and 2 partials ⚠️
reposerver/repository/repository.go	77.77%	3 Missing and 1 partial ⚠️
util/helm/client.go	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #20216      +/-   ##
==========================================
+ Coverage   55.07%   55.21%   +0.13%     
==========================================
  Files         322      324       +2     
  Lines       54927    55042     +115     
==========================================
+ Hits        30253    30389     +136     
+ Misses      22068    22042      -26     
- Partials     2606     2611       +5     

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[blakepettersson]

One minor thing, otherwise this looks great. Thanks!

[Spazzy757]

Hey!

Is there any update on this? We have a pending bug that we would like fixed, but we are waiting on this PR 😄

#20862