Disable Site Design controls in Go Site Editing.

[AnthonyLedesma]

Description

The Site Design controls were built with classic theme functionality in mind. The Site Editor controls now replicate the behavior of the Site Design controls inside of CoBlocks and we no longer need this tool with GSE.

With this PR the controls will remain as backward compatible.

Screenshots

Types of changes

PHP and JS mods to allow conditional disable for GSE context.

How has this been tested?

Tested manually. Needs tests still.

Acceptance criteria

Should disable when Go is updated to GSE.
Should have a test in place to simulate conditions.

Checklist:

• My code is tested
• My code follows accessibility standards
• My code has proper inline documentation
• I've included any necessary tests
• I've included developer documentation
• I've added proper labels to this pull request

[AnthonyLedesma]

Maybe we should explore hiding the controls altogether. Right now things are still disabled. Having controls disabled here has the benefit of showing, even if a user is on another theme, it still points them to get GSE where they have baked-in site design controls.

[AnthonyLedesma]

Even better if we can deep-link into the GSE design controls. @jrtashjian Do you think it is reasonable to deep-link straight to the Site Editor in Go? See the image for details - we can have a link.
Core may have a solution for us soon.

WordPress/gutenberg#49585

[eherman-godaddy]

PR is no longer relevant as we are not uplifting Go to FSE and the site design controls will still work.