Add an optional $post parameter to get_the_title_rss() the same way get_the_title() works

[oglekler]

This will allow it to be used outside of the loop and ensure consistency:

function get_the_title_rss( $post = 0 ) {
	$title = get_the_title( $post );

	/**
	 * Filters the post title for use in a feed.
	 *
	 * @since 1.2.0
	 *
	 * @param string $title The current post title.
	 */
	return apply_filters( 'the_title_rss', $title );
}

Use case: I'm adding related posts to a feed item and I only need the title, link and thumbnail, so there's no need to setup global $post and then reset it.

Trac ticket: #61139

[SergeyBiryukov]

In 58096:

Feeds: Add an optional $post parameter to get_the_title_rss().

This allows the function to be used outside of the loop and brings parity with get_the_title().

Follow-up to [1976], [3314], [21735].

Props khokansardar, oglekler.
Fixes #61139.

Thanks for the PR! Merged in r58096.