chore: Fix label and add opposite assertion for toEqual tests

[pedrottimark]

Summary

As prerequisite to improve toEqual matcher report, fix a confusing mistake in its tests:

• {pass: true} is label for snapshot when .not.toEqual fails (it’s a double negative :)
• verify that opposite assertion passes like similar tests of toHaveProperty matcher

Bonus change for 'failure message matches the expected snapshot':

• move test of different values for same key to {pass: fail} tests
• remove test of same values for same key because it is redundant with {pass: true} tests

Test plan

• Updated names of 48 snapshot tests
• Moved and renamed 1 snapshot test
• Deleted 1 snapshot test

[codecov-io]

Codecov Report

Merging #8288 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #8288   +/-   ##
=======================================
  Coverage   62.14%   62.14%           
=======================================
  Files         266      266           
  Lines       10666    10666           
  Branches     2590     2590           
=======================================
  Hits         6628     6628           
  Misses       3448     3448           
  Partials      590      590

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[github-actions]

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