[Fix] order: codify invariants from docs into config schema

[Xunnamius]

Updating schema wrt #3127 (comment)

EDIT: depends on #3129 for its added tests

[ljharb]

This PR seems to have too much stuff in it - but either way, if a rule or option is already released, its schema can’t be tightened further.

[Xunnamius]

@ljharb It seems like it has a lot because it's on top of the consolidateIslands PR (rather than main so the schema changes can run against the latest tests), but the two new commits are tiny and only touch the schema and two tests. I can pull the lines around dependencies/consolidateIslands one commit up into the consolidateIslands PR if desired :)

EDIT: I can also rebase onto main and decouple from the other PRs, but not hitting all the new tests plus no direct tests of the schema makes me a bit nervous.

As for the tightening of existing options, I assume you're talking about lines 865 and 866 for pathGroupsExcludedImportTypes? I can revert those. I did add a comment to the groups schema warning that additional validation happens elsewhere, and added two newlines to the named schema for consistency, but those changes should be just cosmetic.

[ljharb]

In that case, I'll wait to review this since it needs to wait on #3129

[ljharb]

these changes are non-breaking iff they exclude things that the rule already checks.

… which would also imply there's some code that can be removed, since the checks are not guaranteed to be done by eslint?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.63%. Comparing base (4f145a2) to head (a73a2f2).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3152      +/-   ##
==========================================
+ Coverage   95.17%   95.63%   +0.45%     
==========================================
  Files          83       83              
  Lines        3688     3687       -1     
  Branches     1331     1330       -1     
==========================================
+ Hits         3510     3526      +16     
+ Misses        178      161      -17     

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