refactor: Disable FPE mask printing if FPEMON is disabled by envvar (#…

…2670)

The summary of the FPE masks is quite verbose, and if the environment variable `ACTS_SEQUENCER_DISABLE_FPEMON` is set, one is probably not interested in this output.

Examples/Python/python/acts/examples/__init__.py

@@ -527,7 +527,7 @@ def _getAutoFpeMasks(cls) -> List[FpeMask]:
 
     @classmethod
     def _printFpeSummary(cls, masks: List[FpeMask]):
-        if len(masks) == 0:
+        if len(masks) == 0 or "ACTS_SEQUENCER_DISABLE_FPEMON" in os.environ:
             return
 
         # Try to make a nice summary with rich, or fallback to a plain text one