[MMI] Add Signature-request unit test

[albertolive]

Explanation

Add Signature-request unit test

Pre-merge author checklist

• I've clearly explained:
  • What problem this PR is solving
  • How this problem was solved
  • How reviewers can test my changes
• Sufficient automated test coverage has been added

Pre-merge reviewer checklist

• Manual testing (e.g. pull and build branch, run in browser, test code being changed)
• IF this PR fixes a bug in the release milestone, add this PR to the release milestone

If further QA is required (e.g. new feature, complex testing steps, large refactor), add the Extension QA Board label.

In this case, a QA Engineer approval will be be required.

[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.

[metamaskbot]

Builds ready [8c3274a]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4
  • common: 0, 1, 2, 3, 4, 5, 6
  • content-script: 0
  • contentscript: contentscript
  • disable-console: disable-console
  • inpage: inpage
  • policy-load: policy-load
  • sentry-install: sentry-install
  • ui: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (850 ± 367 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	84	130	98	13	6
		domContentLoaded	71	119	90	13	6
		load	79	1871	850	764	367
		domInteractive	71	119	90	13	6

Bundle size diffs

• background: 0 Bytes (0.00%)
• ui: -1 Bytes (-0.00%)
• common: 0 Bytes (0.00%)

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (6e4bf67) 68.35% compared to head (8c3274a) 68.37%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #21058      +/-   ##
===========================================
+ Coverage    68.35%   68.37%   +0.02%     
===========================================
  Files         1007     1007              
  Lines        40269    40269              
  Branches     10773    10773              
===========================================
+ Hits         27524    27532       +8     
+ Misses       12745    12737       -8     

Files	Coverage Δ
...ponents/app/signature-request/signature-request.js	83.10% <ø> (+8.45%)	⬆️

... and 1 file with indirect coverage changes

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