Fix: Add missing strict_types declarations to Abilities Explorer

[huzaifaalmesbah]

Description

This PR standardizes the code in the includes/Experiments/Abilities_Explorer directory by adding: declare( strict_types=1 ); to files where it was missing.

Changes

Added declare( strict_types=1 ); to:

• includes/Experiments/Abilities_Explorer/Abilities_Explorer.php
• includes/Experiments/Abilities_Explorer/Ability_Handler.php
• includes/Experiments/Abilities_Explorer/Ability_Table.php
• includes/Experiments/Abilities_Explorer/Admin_Page.php

Reasoning

• Ensures strict type enforcement
• Improves type safety and reduces implicit type coercion bugs
• Aligns these files with the rest of the codebase (e.g., includes/bootstrap.php, includes/helpers.php)
• Maintains consistency and coding standards across the project

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

If you're merging code through a pull request on GitHub, copy and paste the following into the bottom of the merge commit message.

Co-authored-by: huzaifaalmesbah <huzaifaalmesbah@git.wordpress.org>

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.80%. Comparing base (b8c3e49) to head (1351969).
⚠️ Report is 5 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #208   +/-   ##
==========================================
  Coverage      50.80%   50.80%           
  Complexity       375      375           
==========================================
  Files             27       27           
  Lines           1978     1978           
==========================================
  Hits            1005     1005           
  Misses           973      973           

Flag	Coverage Δ
unit	50.80% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.