[admin] Consistently use label for providing text for table scopes, batch actions and filters

[elia]

Summary

The names chosen over time weren't consistent.

Checklist

Check out our PR guidelines for more details.

The following are mandatory for all PRs:

• I have written a thorough PR description.
• I have kept my commits small and atomic.
• I have used clear, explanatory commit messages.

The following are not always needed:

• 📖 I have updated the README to account for my changes.
• 📑 I have documented new code with YARD.
• 🛣️ I have opened a PR to update the guides.
• ✅ I have added automated tests to cover my changes.
• 📸 I have attached screenshots to demo visual changes.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (64f6a58) 88.66% compared to head (e717cdb) 88.66%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
...mponents/solidus_admin/products/index/component.rb	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5593   +/-   ##
=======================================
  Coverage   88.66%   88.66%           
=======================================
  Files         683      683           
  Lines       16293    16293           
=======================================
  Hits        14446    14446           
  Misses       1847     1847           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.