chore: add code coverage

[dotmh]

This adds code coverage to vitest in the template and installs the dependencies at the workspace's root to be used wherever required.

It adds a new PNPM task called test:coverage to run the coverage generator and exit. This stops an issue where vitest will only run changed tests, which messes up the coverage report.

It adds a new PNPM task called test:coverage to the project's root, which allows it to run code coverage in all packages.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[socket-security]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/@vitest/[email protected]	Transitive: environment, filesystem, shell	+88	16.1 MB	vitestbot
npm/[email protected]	Transitive: filesystem	+3	680 kB	hirokiosame
npm/[email protected]	Transitive: environment, filesystem, network, shell, unsafe	+39	10.6 MB	antfu, oreanno, patak, ...1 more

🚮 Removed packages: npm/[email protected], npm/[email protected]

View full report↗︎