Improve security key handling in pluggable.php

[spacedmonkey]

Requires #61053.

Use wp_prime_site_option_caches to prime option / network option caches if not defined as const.

Trac ticket: https://core.trac.wordpress.org/ticket/59871

[github-actions]

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[github-actions]

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[peterwilsoncc]

A couple of notes, the main issue is that it doesn't prime the options if the constant is defined with put your unique phrase here or the translated version.

[peterwilsoncc]

This accounts for duplicate values and constants defined with the value from the sample config file, ie define( 'thing', 'put your unique phrase here' ).

Suggested change

	$duplicated_keys[ $value ] = isset( $duplicated_keys[ $value ] );
	$duplicated_keys[ $value ] = isset( $duplicated_keys[ $value ] );
	if ( true === $duplicated_keys[ $value ] ) {
	$option_prime[] = strtolower( "{$first}_{$second}" );
	}

[peterwilsoncc]

I think this would be clearer with a rename.

🔢 Applies throughout, including the suggested change I've made.

Suggested change

	$option_prime = array();
	$options_to_prime = array();

[spacedmonkey]

Closing in favour of #6720