bug(on-pr): common checks enables cache too late

### Description

In [lifecycle](https://github.com/eclipse-score/lifecycle), our pre-commit hooks depend on Bazel. Since the "common checks" workflow installs the Bazel cache after already running pre-commit, it cannot take advantage of the cache and so it is very slow.

Example: https://github.com/eclipse-score/lifecycle/actions/runs/32033359702/job/95398109206
In this case the "common checks" took three times as long as our actual project build.

### Solution

Moving the Bazel cache action to the top of the workflow should improve this.