Update yaml globs for Helm to support common chart structures

[frekw]

Minor fix, but this bit my colleague the other day and had him pretty confused as to why his chart was broken, so I thought I'd fix it upstream.

[lilatomic]

Thanks for the fix! Can you please also add an entry to the changelog in "docs/notes/2.25.x.md" under the Helm section?

I've also marked this MR for packporting

[lilatomic]

Tested and looks good!

[cburroughs]

I'm going to go ahead and add a brief doc note. Thank you for your contribution!

[WorkerPants]

I tried to automatically cherry-pick this change back to each relevant milestone, so that it is available in those older releases of Pants.

✔️ 2.23.x

Successfully opened #21897.

✔️ 2.24.x

Successfully opened #21896.

❌ 2.25.x

I was unable to cherry-pick this PR to 2.25.x, likely due to merge-conflicts.

Steps to Cherry-Pick locally

To resolve:

1. (Ensure your git working directory is clean)
2. Run the following script to reproduce the merge-conflicts:

   git fetch https://github.com/pantsbuild/pants main \
     && git fetch https://github.com/pantsbuild/pants 2.25.x \
     && git checkout -b cherry-pick-21692-to-2.25.x FETCH_HEAD \
     && git cherry-pick 390416b46864ef463945980fc98266a7f8443c9b

3. Fix the merge conflicts and commit the changes
4. Run build-support/cherry_pick/make_pr.sh "21692" "2.25.x"

Please note that I cannot re-run CI if a job fails. Please work with your PR approver(s) to re-run CI if necessary.

---

When you're done manually cherry-picking, please remove the needs-cherrypick label on this PR.

Thanks again for your contributions!

🤖 Beep Boop here's my run link

[cburroughs]

Whoops, didn't mean to cheery pick