Remove deprecated `match_expressions`

[kwapik]

Checklist

• [ ] Tested in playground or other setup

Summary by CodeRabbit

• Refactor

  • Updated label matching logic to use match_list in place of the deprecated match_expressions.

• Documentation

  • Removed references to deprecated match_expressions from the configuration specification.

• Chores

  • Removed obsolete code related to backward compatibility in label matching.

[coderabbitai[bot]]

Walkthrough

The recent updates involve the deprecation of match_expressions in favor of match_list for Kubernetes-style label matching. This change streamlines the label matching process by removing outdated code and documentation, ensuring that the system uses the updated match_list method exclusively.

Changes

File Path	Change Summary
api/.../v1/label_matcher.proto	Removed deprecated match_expressions
docs/.../spec.md	Removed content related to deprecated match_expressions
pkg/.../selectors/selector.go	Removed backCompatConvLabelMatcher function and updated MMExprFromLabelMatcher logic

Poem

🐇✨ In the code where labels dance,
Old expressions had no chance.
match_list now leads the prance,
A rabbit's cheer for the advance!
🎉🌟

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