feat: filter unused blobs when cloning repo

[BtbN]

Description

Instructs git to do a blob-filtered clone.
This can potentially save a lot of time, traffic and space, depending on the repo in question, and it does no harm if not.

How Has This Been Tested?

Deployed on our Forgejo instance and works fine.
Git gracefully falls back to a full clone if the remote does not support filters, so this is pretty risk free.

Checklist

• Tests added if applicable.
• Documentation updated if applicable.

Merge criteria:

• The commits and have meaningful messages; the author will squash them after approval or will ask to merge with squash.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟢	Statements	89.37%	555/621
🟢	Branches	85.48%	259/303
🟢	Functions	87.92%	131/149
🟢	Lines	89.22%	538/603

Test suite run success

218 tests passing in 18 suites.

Report generated by 🧪jest coverage report action from 0e3aa86