PRs containing blobs in history pass the action

[FloThinksPi]

Describe the bug
Given your HEAD commit in a PR/Branch does not have a blob, the tests succeeds even when in a commit in the PR introduces a Blob.

Is there a way to detect this in an action ?

To Reproduce
Steps to reproduce the behavior:

1. Make a branch/PR, have the action validate the PR
2. Make a commit with a blob(tests fail)
3. Make a second commit that converts this blob to a LFS reference(tests succede)
4. Merge that PR (strategy merge/rebase)
5. Now you have a blob in main branch (not in the HEAD but in the history so it blows up the repo size)

Expected behavior
Test fails when in the history of the PR a blob is found

Actual behaviour
Tests succedee as long as the HEAD commit of the branch has no blobs in it.