Options: Mask connector API keys on All Options screen

[jorgefilipecosta]

Description

Connector API keys are visible in plain text on the All Options screen
(wp-admin/options.php). The connectors system masks keys via
option_{$option_name} filter, but options.php queries the database
directly, bypassing get_option().

Steps to Reproduce

1. Configure a connector API key via Settings > Connectors
2. Navigate to wp-admin/options.php
3. Search for connectors_

Proposed Solution

Add an elseif branch that masks options matching connectors_*_api_key
using the existing _wp_connectors_mask_api_key() function.

Related

PR: ​https://github.com/WordPress/wordpress-develop/pull/11158

## Summary

• Masks connector API keys on the wp-admin/options.php page using the existing _wp_connectors_mask_api_key() function
• Keys matching connectors_*_api_key pattern are displayed with bullets + last 4 chars
• Fields are disabled and excluded from form submission

Ticket: https://core.trac.wordpress.org/ticket/64793#ticket

## Test plan

• [ ] Navigate to wp-admin/options.php
• [ ] Verify connector API keys show masked values (e.g., ••••••••••••PDU')
• [ ] Verify the fields are disabled
• [ ] Verify the Connectors settings page still works normally

## Screenshot

[westonruter]

An alternative would be to store all the keys in a single connectors_api_keys option, which would result in them getting stored as a serialized array, and thus appear as SERIALIZED DATA on the options.php screen.

[jorgefilipecosta]

In 61829:

Options: Mask connector API keys on All Options screen.

Connector API keys were visible in plain text on wp-admin/options.php
because it queries the database directly, bypassing the get_option()
filter that normally masks these values.
This adds masking for options matching the connectors_*_api_key pattern
using the existing _wp_connectors_mask_api_key() function, and disables
editing from this screen.

Props jorgefilipecosta, gziolo, ocean90.
Fixes #64793.