fix(snapshot-utils): snapshot header regexp to work with newline across OSes

[hainenber]

Summary

Resolves #15799

Test plan

• Green CI
• Manual verification by affected folks
  • Confirmed worked on Windows using forked repo's CI

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commit: 31eb6d2

[hainenber]

@Mlocik97 can you verify if this PR's Jest build work out for your case? You can use this sample PR for testing, that is if corporate proxy can allow such domain.

[cpojer]

Thank you.

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