Disable most of pre-commit checks during PR presubmit

[codificat]

As discussed in the tech talk yesterday: the goal of this PR is to disable (most of) the pre-commit checks that prow runs on PRs (by running only one specific hook and not the others) in order to facilitate the hackmd->repo flow.

The idea is:

• PRs that come from a sync from hackmd are not subject to pre-commit lint/tab/etc checks. We can live with some extra spaces in the README for a while, and we (should) know that things look well in hackmd
• PRs created by individuals should still take care of running pre-commit locally before submitting the PR

Note: the pre-commit check can not be completely disabled because the current prow configuration requires it to pass before merging to main. An alternative could be to remove this repo's branch protection

[sesheta]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: harshad16

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