Setting _wpGutenbergCodeEditorSettings is unnecessary

[noisysocks]

The HTML block used to use wp.codeEditor to add syntax highlighting, but this was [later removed](​https://github.com/WordPress/gutenberg/pull/10396). Setting window. _wpGutenbergCodeEditorSettings when the block editor loads is therefore unnecessary.

[noisysocks]

This means that wp_get_code_editor_settings which was added in r43761 is no longer necessary. Not sure if we should remove it or not—it's likely a useful API for plugins including Gutenberg.

Thoughts, @pento?

[pento]

Will we be looking at adding the code editor back in at some point? It seems the main issue is that we need to figure out a way to do lazy loading, then it can come back.

[noisysocks]

Maybe. It's not a sure thing. There's also talk in ​https://github.com/WordPress/gutenberg/issues/10423 of moving from CodeMirror to a different library.

[pento]

I'm inclined to leave r43761 in. CodeMirror is the most likely thing we'll use, even if we wait for ​CodeMirror 6.

[pento]

In 43857:

Block Editor: Remove CodeMirror settings.

CodeMirror is no longer used in the block editor, so we don't need to load the settings.

Props noisysocks.
Fixes #45248.

[SergeyBiryukov]

Reopening for trunk.

[jeremyfelt]

In 44223:

Block Editor: Remove CodeMirror settings.

CodeMirror is no longer used in the block editor, so we don't need to load the settings.

Merges [43857] from the 5.0 branch to trunk.

Props noisysocks.
Fixes #45248.