Add ignore_order= argument to expect_lint()

[MichaelChirico]

For #2801, I'm trying to rewrite this to use expect_lint(), it generates 192 lints, quite cumbersome to ensure the lints are all in the expected order.

I am tempted to make ignore_order=TRUE the default, actually, I'm not sure how meaningful it is to test the order in which lints are produced. But that would possibly be a breaking change.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.59%. Comparing base (0939d20) to head (5522ae1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2802   +/-   ##
=======================================
  Coverage   99.59%   99.59%           
=======================================
  Files         125      125           
  Lines        6863     6872    +9     
=======================================
+ Hits         6835     6844    +9     
  Misses         28       28           

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