Blueprint CI: Added path filters to optimise resources

Stream: Equational

[Pietro Monticone]

I have added path filters to the workflows triggered on push and PR events so that they run only if there has been any change in the relevant files in order to optimise resources for everyone.

Sorry for not caching that earlier :man_facepalming:

[Cody Roux]

Serendipitous caching/catching typo!