Move inline JS from admin_head hooks in options screens into options.js

[anukasha]

src/wp-admin/includes/options.php contains three functions that print inline <script> blocks via admin_head hooks:

1. options_discussion_add_js() — hooked in options-discussion.php
2. options_general_add_js() — hooked in options-general.php
3. options_reading_add_js() — hooked in options-reading.php

These should be migrated into src/js/_enqueues/admin/options.js, which was introduced in ​https://github.com/WordPress/wordpress-develop/pull/10927 as the central enqueued JS file for options screens.

[wpdevsxyz]

This patch moves the three inline <script> blocks from admin_head hooks into
a new enqueued file: src/js/_enqueues/admin/options.js.

Changes:

• Created src/js/_enqueues/admin/options.js with all three JS blocks combined
• Registered 'options' script handle in script-loader.php (jquery dependency, footer)
• options-general.php: wp_enqueue_script('options') + wp_localize_script() to pass homeURL
• options-discussion.php: wp_enqueue_script('options')
• options-reading.php: wp_enqueue_script('options')
• Deprecated options_discussion_add_js(), options_general_add_js(), options_reading_add_js() in 7.1.0

This pull request is for code review only.

Trac ticket: https://core.trac.wordpress.org/ticket/65070

Summary:

• Moves inline JS from admin_head hooks for options screens into options.js
• Centralizes the behavior in the enqueued JS file
• Deprecates the old inline JS hook functions

Fixed backward compatibility issue raised in review — deprecated
functions now call wp_enqueue_script('options') (and
wp_localize_script() for options_general_add_js) so external
callers continue to work while still triggering the deprecation notice.

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The code changes were made manually. I used Claude as an AI assistant to help understand the codebase and plan the approach, but all the actual code was written and reviewed by me.