Mail: Wrap phpmailer_init hook in try-catch to log initialization failures

[Kajori-Biswas]

This PR wraps the phpmailer_init hook (do_action_ref_array( 'phpmailer_init', array( &$phpmailer ) )) in a try-catch block within wp_mail() to ensure that exceptions during mail initialization are properly caught and logged.

Currently, if an exception occurs during the execution of the phpmailer_init hook, it may fail silently or without sufficient logging, making it difficult to identify the root cause of mail delivery issues.

In real-world scenarios, failures can occur due to issues such as:

File permission errors (e.g., inaccessible files in wp-content/uploads)
Invalid attachments or embedded resources
Third-party hook implementations throwing exceptions

These failures can result in generic errors like "wp_mail failed" without exposing the underlying cause.

Solution:
Wrapped the phpmailer_init hook execution in a try-catch block
Ensured that any thrown exceptions are properly captured
Allows meaningful error messages to be logged for debugging purposes

Trac ticket: #64940

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[github-actions]

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[github-actions]

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