Explain which snapshots are obsolete

[zouxuoz]

Summary

Resolve #5005

Test plan

[zouxuoz]

@cpojer @SimenB @thymikee what are you think about UX? Maybe we should add flag for that?)

[codecov-io]

Codecov Report

Merging #5020 into master will decrease coverage by 0.02%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master    #5020      +/-   ##
==========================================
- Coverage   60.44%   60.42%   -0.03%     
==========================================
  Files         198      198              
  Lines        6634     6640       +6     
  Branches        4        4              
==========================================
+ Hits         4010     4012       +2     
- Misses       2624     2628       +4

Impacted Files	Coverage Δ
.../src/legacy_code_todo_rewrite/jest_adapter_init.js	0% <ø> (ø)	⬆️
packages/jest-cli/src/test_scheduler.js	25.54% <ø> (ø)	⬆️
packages/jest-jasmine2/src/index.js	5.71% <0%> (-0.17%)	⬇️
packages/jest-snapshot/src/State.js	0% <0%> (ø)	⬆️
packages/jest-cli/src/test_result_helpers.js	12.5% <0%> (-0.41%)	⬇️
...ages/jest-cli/src/reporters/get_snapshot_status.js	100% <100%> (ø)	⬆️

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[SimenB]

This was a surprisingly elegant solution! I like it :)

(Could you update the changelog? :D)

[zouxuoz]

@SimenB Updated 😉

[cpojer]

This is great work. Thanks @zouxuoz

[crubier]

Wow 2 days from issue to PR merge, amazing, I love jest ! Thanks @zouxuoz and @cpojer !

[github-actions]

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