feat: Convert MetaMetricsController tests from mocha to jest

[itsyoboieltr]

Description

This PR converts app/scripts/controllers/metametrics.test.js from mocha to jest. In particular, replaces instances of assert with expect, and removes sinon and uses jest's mocking capabilities in its place. The jest.config.js was updated to include app/scripts/controllers/metametrics.test.js in the testMatch array. The .mocharc.js was updated to ignore the test.

Related issues

Fixes: #19355, #25092

Manual testing steps

1. Running yarn jest -- app/scripts/controllers/metametrics.test.js and seeing all tests pass
2. Running yarn test:unit:mocha and not seeing the metametrics tests run.

Screenshots/Recordings

Not applicable

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

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.

[metamaskbot]

Builds ready [1ac0f11]

• 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, 5
  • common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
  • ui: 0, 1, 10, 11, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (45 ± 5 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	60	112	75	11	5
		domContentLoaded	8	47	11	8	4
		load	40	89	45	10	5
		domInteractive	8	47	11	8	4

Bundle size diffs

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.38%. Comparing base (6eee01a) to head (3154644).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #25210      +/-   ##
===========================================
- Coverage    65.69%   65.38%   -0.31%     
===========================================
  Files         1377     1377              
  Lines        54624    54624              
  Branches     14317    14317              
===========================================
- Hits         35882    35712     -170     
- Misses       18742    18912     +170     

☔ View full report in Codecov by Sentry.
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[metamaskbot]

Builds ready [3154644]

• 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, 5
  • common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
  • ui: 0, 1, 10, 11, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (47 ± 11 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	61	229	82	35	17
		domContentLoaded	8	23	10	3	2
		load	37	148	47	23	11
		domInteractive	8	23	10	3	2

Bundle size diffs

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