Ignore .wp-env.test.override.json

[t-hamano]

Follow-up to #447

What?

Adds /.wp-env.test.override.json to .gitignore so a local test-only wp-env override file is never tracked.

Why?

Sometimes, we might want to change the settings of our test environment, not just our development environment, locally.

Use of AI Tools

AI assistance: Yes
Tool(s): Claude Code
Model(s): Claude Opus 4.7
Used for: Drafting the commit message and PR description; the change itself is a one-line .gitignore addition reviewed and verified by me.

Changelog Entry

Development Update - Ignore /.wp-env.test.override.json so local test-only wp-env overrides stay untracked.

[github-actions]

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Co-authored-by: t-hamano <wildworks@git.wordpress.org>

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.06%. Comparing base (a44e792) to head (a17722e).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #484   +/-   ##
==========================================
  Coverage      69.06%   69.06%           
  Complexity       957      957           
==========================================
  Files             60       60           
  Lines           4512     4512           
==========================================
  Hits            3116     3116           
  Misses          1396     1396           

Flag	Coverage Δ
unit	69.06% <ø> (ø)

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