fix(shared): raise timeout on fxa-shared DB integration setup hooks

[vbudhram]

Because

• Four fxa-shared DB integration suites flaked on the CI job "Integration Test - Libraries (PR)".
• Their before() hook calls testDatabaseSetup. That drops and recreates the test database and runs about 30 SQL schema files, so it can pass mocha's default 2000 ms timeout.
• When the hook timed out, knex was never assigned. The after() hook then threw "Cannot read properties of undefined (reading 'destroy')", which hid the real failure.

This pull request

• Gives the before() hook in each of the four specs a 20 second timeout. The callback is now function () so it can call this.timeout(20000).
• Changes after() to await knex?.destroy() so a failed setup reports only its own error.
• Touches auth/index.spec.ts, auth/prune-token.spec.ts, auth/sent-emails.spec.ts and profile/index.spec.ts under packages/fxa-shared/test/db/models/.

Issue that this pull request solves

Closes: FXA-14596

Checklist

Put an x in the boxes that apply

• My commit is GPG signed.
• If applicable, I have modified or added tests which pass locally.
• I have added necessary documentation (if appropriate).
• I have verified that my changes render correctly in RTL (if appropriate).
• I have manually reviewed all AI generated code.

How to review (Optional)

• Key files/areas to focus on: the before() and after() hooks in the four spec files.
• Suggested review order: any order. The change is the same in each file.
• Risky or complex parts: none. Only test code changes.

Screenshots (Optional)

Other information (Optional)

• The four specs pass locally with mocha against MySQL: 70 passing, 0 failing.
• npx tsc -p packages/fxa-shared/tsconfig.json --noEmit and npx nx lint fxa-shared both exit 0.
• No new tests. The change is to the tests themselves. Functional tests did not run, because this change does not affect them.

[Copilot]

Copilot review overview

🟢 Approval recommended

The focused test-only changes correctly address slow setup and prevent teardown from masking setup failures.

Review effort: Balanced
Findings: None

What changed in this PR

Stabilizes four fxa-shared database integration suites and preserves the original setup failure.

Changes:

• Raises database setup hook timeouts to 20 seconds.
• Makes teardown safe when setup fails before assigning knex.

File	Description
auth/​index.spec.ts	Hardens auth integration setup and teardown.
auth/​prune-token.spec.ts	Hardens token-pruning integration setup and teardown.
auth/​sent-emails.spec.ts	Hardens sent-email integration setup and teardown.
profile/​index.spec.ts	Hardens profile integration setup and teardown.

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