Avoid env-var-secret false positives for SECRETS_* names

[arpitjain099]

Fixes #1198.

The built-in env-var-secret check used (?i).*secret.*, which also matched names like SECRETS_DIR.

This narrows the built-in pattern so plural secrets suffixes are not flagged, and extends the fixture with a SECRETS_DIR case to keep that behavior covered.

Verification:

• go test ./pkg/builtinchecks/...
• go run ./cmd/kube-linter lint --include env-var-secret --do-not-auto-add-defaults --format json tests/checks/env-var-secret.yml

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 30.71%. Comparing base (dbd7529) to head (20df834).
⚠️ Report is 316 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1206       +/-   ##
===========================================
- Coverage   62.36%   30.71%   -31.65%     
===========================================
  Files         197      239       +42     
  Lines        4854     6534     +1680     
===========================================
- Hits         3027     2007     -1020     
- Misses       1439     4351     +2912     
+ Partials      388      176      -212     

Flag	Coverage Δ
unit	30.71% <ø> (-31.65%)	⬇️

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