Remove autocheck + status-indicator styles

[simurai]

What are you trying to accomplish?

This closes #442 by removing all styles that reference an image asset like url('/images/....

What approach did you choose and why?

• 🔥 Remove autocheck styles
• 🔥 Remove status-indicator styles

They will be moved to dotcom with https://github.com/github/github/pull/260973.

What should reviewers focus on?

This is technically a major change, but I marked it as a patch. Reasons to maybe get away with it:

• The styles that are removed are undocumented and are dependant on JS from dotcom, so I think there is a lower chance that someone has been using them.
• That issue has been open for many years, so would be good to finally fix it without having to wait for the next major release.

Let me know if you think it's too risky.

Can these changes ship as is?

• ⚠️ No, dotcom needs to add these styles. Change base branch in https://github.com/github/github/pull/260973 and merge it into the bump PR.

[changeset-bot]

🦋 Changeset detected

Latest commit: 1c8b98c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/css	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[jonrohan]

These classes aren't used in PVC 🚀

[simurai]

These classes aren't used in PVC

Ahh.. good point. I search a bit more in the primer + github orgs. I found one place that seems to use the status-indicator. But that repo is still on "@primer/css": "^15.1.0",. So I assume they are not gonna update anytime soon since it probably would break lots of other things too.