[feat] Support version-like environment names

[RiMillo]

This relaxes the validation schema for environment names to allow, for instance, foo-1.0.0, 2026.09.0.

Fixes #3645.

[RiMillo]

Hello,

I pushed it as draft because I would like to check with maintainers some things first:

• If new ref name is acceptable, alphanum_ext_vers_string
• If pattern is OK or should be extended (e.g., to accepts names like foo-1.0.0+alpha, notice + not included now)
• If it should be applied also to system and partition names (ATM, it's only for environment)
• If a test is needed. If so, guidance / suggestions are appreciated. ATM, I found something that might be related, test_validate_config_invalid_syntax, but it checks only system names.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.92%. Comparing base (00ffd41) to head (315bba9).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3720   +/-   ##
========================================
  Coverage    91.92%   91.92%           
========================================
  Files           62       62           
  Lines        13808    13808           
========================================
  Hits         12693    12693           
  Misses        1115     1115           

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[RiMillo]

Not sure how to deal with failing CI-job about performance benchmark(?)