Only start pylama and shellcheck linters when needed & fix interruptible linters

What does this MR do and why?

Start pylama and shellcheck only when it's needed, as all warning/error for theses linters has been solved we could start them only when a .py of .sh file is changed. It would help to save some CI time.

Also fix a minor issue that prevent linter jobs to be interruptible. As gitleaks was not interruptible by default and start immediately it prevent al the others jobs to be interruptibles