Docs: Add blog post for EXPERIMENTAL_useProjectService

[JoshuaKGoldberg]

Before You File a Documentation Request Please Confirm You Have Done The Following...

• I have looked for existing open or closed documentation requests that match my proposal.
• I have read the FAQ and my problem is not listed.

Suggested Changes

Following #7349: once EXPERIMENTAL_useProjectService is known to be not-terrible in v6, we can add a blog post explaining it. The post should mention why it exists, its pros (performance! simpler .js file configuration!), its cons (?), and that it's experimental & likely to change in v7.

I'll also set up a GitHub Discussion for folks to give feedback. The blog post can link to it.

Blocked on:

• Docs: Add mention of EXPERIMENTAL_useProjectService to parser docs #7349
• Docs: Add post on parserOptions.project = true #6520: It would feel weird to me to publish this one first...
• Repo: Our EXPERIMENTAL_useProjectService unit tests are much slower in CI #7348: or at least better understanding it

Affected URL(s)

https://typescript-eslint.io/blog/experimental-project-service

[NextThread]

Hey @JoshuaKGoldberg are you working on this ?

[JoshuaKGoldberg]

👋 see the OP - it's blocked on #6520 and #7348. I'll work on it once those are done.