Block Editor: Remove experimental Social Links blocks

[gziolo]

We decided to mark Social Links block as an experimental feature in Gutenberg. In effect, we are moving all related code from WordPress 5.3 release. This PR handles it.

I also tested whether removing Social Links blocks will have an impact on the size of code sent to the users.

I used wordpress-develop without gzip enabled.

Trunk/master

Patch/branch

[gziolo]

Diff - size of the document

[gziolo]

Trunk - size of the document

[gziolo]

Branch - size of JS files

[gziolo]

Trunk - size of JS files

[gziolo]

Tested with Travis: ​https://github.com/WordPress/wordpress-develop/pull/107.

[youknowriad]

Do we need to remove the php files? I mean can't we just remove the includes. The issue I see if we remove the php files is that we might get a diff locally, each time we do npm install && npm run grunt build.

[gziolo]

Do we need to remove the php files? I mean can't we just remove the includes. The issue I see if we remove the php files is that we might get a diff locally, each time we do npm install && npm run grunt build.

You shouldn't experience this issue as long as the related PHP isn't whitelisted:
​https://github.com/WordPress/wordpress-develop/pull/107/files#diff-df0280933db62a33cd94973b5ec4871eL106

[davidbaumwald]

With 5.3 RC1 releasing today and work still left on this ticket, it is being moved to Future Release. If any committer feels this can be worked in quickly for 5.3 or can assume ownership in 5.4, feel free to move it back up.

[youknowriad]

Actually, this is ready to ship and I forgot to approve. LGTM commit it @gziolo

[gziolo]

In 46543:

Block Editor: Remove experimental Social Links blocks

We decided to mark Social Links block as an experimental feature in Gutenberg. In effect, we are moving all related code from WordPress 5.3 release.

Props youknowriad.

Fixes #48263.