Add `pre-commit` template.

Add /templates/hooks/template.yml that inherits from .job and does the equivalent of:

hooks:
   extends: .job
   stage: .pre
   script:
     - bazelisk run -- hooks

This assumes that the user has setup @pre-commit in the default way.

We should add the hooks job to ruleset template by default as we want all our projects to use our default hooks.