chore(ci): avoid deploying if linting fails

Previously, the `prepare-deployment` CI job, which requires all unit and
e2e test jobs to have succeeded before running, was ignoring the `lint`
job. As a result, deployments might happen even when there were linting
issues. This looks like an oversight.

This commit ensures that, in addition to unit and e2e tests passing,
linting must also pass before deploying the code or documentation.

Closes #17063