ruby: Move Ruby extension to zed-extensions/ruby repo

[notpeter]

• Closes: ruby: Permission to extract the extension to an external repo #19075

Removes the Ruby extension from the zed tree to https://github.com/zed-extensions/ruby. I used git-filter-repo to generate a synthetic git commit history with a new main tip of zed-extensions/ruby@961cecc. All the historical changes are retained as new commits. I documented the process I used here:

• Document extension extraction process #19085

And used the following expressions.txt

php/ruby: ==>
ruby: ==>
extension: ==>
chore: ==>
zed_extension_api: ==>
regex:(?<![\[a-zA-Z0-9])(#[0-9]{3,5})==>zed-industries/zed\1

TODO:

• Invite @vitallium as Maintainer
• Update extension.toml in that repo to reflect the new location / bump version.
  Bump to 0.2.1 (change repo url) zed-extensions/ruby#1
  Bump version to v0.2.2 zed-extensions/ruby#2
• PR to extensions repo pointing at that new version
  ruby: Bump to version 0.2.2 extensions#1525

If anyone has an feedback/fixes for the synthetic commit history, let me know. It's easy to rerun now and impossible (impractical) to do so later.

Release Notes:

• N/A

[zed-industries-bot]

	Messages
📖	This PR includes links to the following GitHub Issues: #19075 If this PR aims to close an issue, please include a Closes #ISSUE line at the top of the PR body.

Generated by 🚫 dangerJS against 5159368

[maxdeviant]

Synthetic commit history looks great! Cool that you figured out how to rewrite the PR references back into the Zed repo rather than removing them entirely.

[vitallium]

I think that looks great. Thanks!

[notpeter]

For future reference, I missed one thing in modifying the history:
From Cargo.toml we need to remove this:

[lints]
workspace = true

I think it's ok for this transition, but next time I'll modify the steps in EXTRACTION.md to also filter that from the commit history too.

Anyways, new version is available under Extensions in-app: