test: reorg signatures tests to maximize efficiency

[seaona]

Description

In this PR we are splitting up the Signatures test into different files, in the same way we have on Extension:

• eth-sign
• personal-sign
• typed-sign

This helps us run test faster since they can run in parallel: ~ 9 minutes faster in Android

Manual testing steps

• Run tests locally
• Check Bitrise run here https://app.bitrise.io/app/be69d4368ee7e86d/pipelines/c6617bd3-452f-4147-ab73-8c3e201bb1ba

Screenshots/Recordings

Before

Running all tests (Smoke + Confirmations)

After

Running all tests (Smoke + Confirmations)

Related issues

_Fixes https://github.com/MetaMask/MetaMask-planning/issues/1394

Pre-merge author checklist

• I’ve followed MetaMask Coding Standards.
• I've clearly explained:
  • What problem this PR is solving.
  • How this problem was solved.
  • How reviewers can test my changes.
• I’ve indicated what issue this PR is linked to: Fixes #???
• I’ve included tests if applicable.
• I’ve documented any added code.
• I’ve applied the right labels on the PR (see labeling guidelines).
• I’ve properly set the pull request status:
  • In case it's not yet "ready for review", I've set it to "draft".
  • In case it's "ready for review", I've changed it from "draft" to "non-draft".

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (8636b3e) 34.59% compared to head (acb0c98) 34.59%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7372   +/-   ##
=======================================
  Coverage   34.59%   34.59%           
=======================================
  Files        1017     1017           
  Lines       27150    27150           
  Branches     2211     2211           
=======================================
  Hits         9393     9393           
  Misses      17268    17268           
  Partials      489      489           

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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