Resolve "lib/tasks/lint.rake can block indefinitely if stderr fills up"

What does this MR do?

Avoid intermediate pipes for stdout and stderr so they'll not overflow.

• Before: https://gitlab.com/gitlab-org/gitlab-ce/-/jobs/214549815
• After: https://gitlab.com/gitlab-org/gitlab-ce/-/jobs/214807531

Closes #61432 (closed)