Code Quality: Extract model selection helpers for E2E tests

[Infinite-Null]

Summary

Extracts repeated inline Developer Tools menu interactions from E2E tests into two reusable utility functions in helpers.ts.

Changes

tests/e2e/utils/helpers.ts

• Added enableModelSelection( page ) — opens the Developer Tools menu, asserts the menu heading and description are visible, toggles Model Selection on (idempotent: skips if already enabled), and verifies the menu stays open after toggling.
• Added disableModelSelection( page ) — opens the Developer Tools menu, verifies the checkmark SVG is present, toggles Model Selection off (idempotent: skips if already disabled), and closes the menu.

tests/e2e/specs/admin/settings.spec.js

Replaced all inline Developer Tools menu interaction blocks across the following tests with the new helpers:

• Can use developer mode
• Developer settings save button appears, values persist after save, and reset does not require explicit save
• Unsaved developer settings do not persist on page reload
• Developer mode settings are hidden for disabled visual feature cards

Testing

No new test coverage required, existing E2E tests exercise both helpers as part of their normal flow.

[github-actions]

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Co-authored-by: Infinite-Null <ankitkumarshah@git.wordpress.org>

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.50%. Comparing base (56cef56) to head (2f0615f).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #786   +/-   ##
==========================================
  Coverage      76.50%   76.50%           
  Complexity      1868     1868           
==========================================
  Files             89       89           
  Lines           7985     7985           
==========================================
  Hits            6109     6109           
  Misses          1876     1876           

Flag	Coverage Δ
unit	76.50% <ø> (ø)

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