Fix Snapshot Extensions References

[sidferreira]

Summary

Based on #1650, I wanted a way to add a ios / android / whatever text to snapshot's extension.
The first take was to fix the many places that snap and .snap are defined to avoid a repeated work.

Test plan

Still WIP as I would like maintainers' input about how to tackle this issues.

[codecov-io]

Codecov Report

Merging #5842 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5842      +/-   ##
==========================================
- Coverage   63.74%   63.72%   -0.03%     
==========================================
  Files         216      216              
  Lines        7941     7942       +1     
  Branches        3        4       +1     
==========================================
- Hits         5062     5061       -1     
- Misses       2878     2880       +2     
  Partials        1        1

Impacted Files	Coverage Δ
packages/jest-cli/src/lib/is_valid_path.js	100% <ø> (ø)	⬆️
packages/jest-resolve-dependencies/src/index.js	97.82% <ø> (-2.18%)	⬇️
packages/jest-runtime/src/index.js	73.23% <ø> (-0.36%)	⬇️

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[sidferreira]

@SimenB I was checking the coverage effects... it reduced in two files, but it sounds like a false negative... Trying to figure out how to improve...

[github-actions]

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