chore: remove v1alpha1 helm references

[weng271190436]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Requirements:

• run make reviewable for basic local test
• Read and followed fleet-networking's Code of conduct.
• uses conventional commit messages
• includes documentation
• adds unit tests

How has this code been tested

Special notes for your reviewer

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.82%. Comparing base (20d3adf) to head (32702bb).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #347      +/-   ##
==========================================
- Coverage   66.98%   66.82%   -0.16%     
==========================================
  Files          33       33              
  Lines        3786     3786              
==========================================
- Hits         2536     2530       -6     
- Misses       1074     1080       +6     
  Partials      176      176              

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