WIP feat(fxa-auth-server): Migrate 19 route unit tests from Mocha to Jest PART 6

[vbudhram]

Because

• The auth-server is migrating from Mocha to Jest for unit tests (FXA-12610)
• Co-located .spec.ts files improve discoverability and reduce deep relative import paths
• Jest provides better TypeScript support, parallel execution, and modern assertion APIs

This pull request

• Adds 19 co-located Jest .spec.ts files under lib/routes/, migrating from test/local/routes/
• Converts all Chai assertions to Jest expect() and preserves sinon spy/stub assertions
• Replaces proxyquire with jest.mock() where applicable (auth-oauth, cloud-scheduler, oauth utils)
• Converts Mocha lifecycle hooks (before/after) to Jest equivalents (beforeAll/afterAll)
• Adds Container cleanup (Container.reset()) for typedi-based tests
• Original Mocha tests remain in place (coexistence strategy)

Mocha ↔ Jest Parity

File	Mocha Source	Jest Target	Tests
request_helper	test/local/routes/request_helper.js	lib/routes/utils/request_helper.spec.ts	2
validators	test/local/routes/validators.js	lib/routes/validators.spec.ts	91
hawk-fxa-token	test/local/routes/auth-schemes/hawk-fxa-token.js	lib/routes/auth-schemes/hawk-fxa-token.spec.ts	4
shared-secret	test/local/routes/auth-schemes/shared-secret.js	lib/routes/auth-schemes/shared-secret.spec.ts	3
verified-session-token	test/local/routes/auth-schemes/verified-session-token.js	lib/routes/auth-schemes/verified-session-token.spec.ts	10
account	test/local/routes/utils/account.js	lib/routes/utils/account.spec.ts	10
security-event	test/local/routes/utils/security-event.ts	lib/routes/utils/security-event.spec.ts	8
auth-oauth	test/local/routes/auth-schemes/auth-oauth.js	lib/routes/auth-schemes/auth-oauth.spec.ts	4
google-oidc	test/local/routes/auth-schemes/google-oidc.js	lib/routes/auth-schemes/google-oidc.spec.ts	4
refresh-token	test/local/routes/auth-schemes/refresh-token.js	lib/routes/auth-schemes/refresh-token.spec.ts	8
cloud-scheduler	test/local/routes/cloud-scheduler.js	lib/routes/cloud-scheduler.spec.ts	1
mfa (auth-scheme)	test/local/routes/auth-schemes/mfa.js	lib/routes/auth-schemes/mfa.spec.ts	11
cloud-tasks	test/local/routes/cloud-tasks.js	lib/routes/cloud-tasks.spec.ts	2
oauth	test/local/routes/utils/oauth.js	lib/routes/utils/oauth.spec.ts	8
signup	test/local/routes/utils/signup.js	lib/routes/utils/signup.spec.ts	6
clients	test/local/routes/utils/clients.js	lib/routes/utils/clients.spec.ts	9
localization	test/local/routes/utils/cms/localization.js	lib/routes/utils/cms/localization.spec.ts	41
signin	test/local/routes/utils/signin.js	lib/routes/utils/signin.spec.ts	41
mfa (route)	test/local/routes/mfa.js	lib/routes/mfa.spec.ts	3
Total			266

All 266 tests have 1:1 assertion parity with their Mocha equivalents. Verified with 5 consecutive green runs (0 flaky tests).

Issue

Closes: https://mozilla-hub.atlassian.net/browse/FXA-12610

Checklist

• My commit is GPG signed
• Tests pass locally (if applicable)
• Documentation updated (if applicable)
• RTL rendering verified (if UI changed)

Other Information

How to verify:

cd packages/fxa-auth-server
npx jest --no-coverage --forceExit --testPathPattern='lib/routes/(auth-schemes|utils|validators|cloud-scheduler|cloud-tasks|mfa).*\.spec\.ts'

All 19 suites (+ existing ip-profiling.spec.ts exemplar = 20 suites, 280 tests) pass. Mocha originals are untouched and continue to pass independently.
``