Improves the pre-commit configuration to be more inline with new
standard curated configuration.

Adds missing hook documentation.

Related to https://gitlab.com/gitlab-com/gl-infra/common-ci-tasks/-/issues/20

Adds standard pre-commit hooks for Terraform and Jsonnet projects.

Adds a pre-commit hook for go test.

References gitlab-com/gl-infra/common-ci-tasks#20

Adds some documentation on the curated pre-commit hooks provided by this
repository.