fix(test): Migrate more Mocha integration tests to Jest PART 1

[vbudhram]

Because

• We want to improve CI times and auth-server integration tests take time

This pull request

• Adds 10 new Jest .in.spec.ts files mirroring the Mocha originals with 1:1 test parity (93 total test cases)
• Replaces superagent with Node's built-in http module in test helpers to avoid circular reference crashes in Jest workers
• Converts Chai assert.*() assertions to Jest expect().* matchers
• Converts before()/after() to beforeAll()/afterAll() and forEach() version loops to describe.each()
• Updates jest-global-setup.ts to generate config/version.json in worktree environments where git rev-parse fails
• Updates jest-global-teardown.ts to clean up the generated version.json

Issue

Closes: https://mozilla-hub.atlassian.net/browse/FXA-12622

Checklist

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

Other Information

Stability: Ran yarn test-integration-jest 5 times consecutively — all 417 tests passed on every run with zero flakes.

No Mocha files removed in this PR. The original .js test files remain until the full migration is complete and the Mocha runner can be retired.

Test Parity: Mocha vs Jest

Test Suite	Mocha Source	Jest Tests	Mocha Tests	Parity
attached_clients_tests	.js	5	5	Full
device_tests	.js	18	18	Full
device_tests_refresh_tokens	.js	13	13	Full
misc_tests	.js	16	16	Full
oauth_tests	.js	12	12	Full
oauth_session_token_scope_tests	.js	8	8	Full
session_tests	.js	13	13	Full
push_db_tests	.js	1	1	Full
pushbox_db	pushbox/db.ts	6	6	Full
sign_key_tests	.js	1	1	Full
Total		93	93	Full