related: #53395

original warning:

providers/singularity/src/airflow/providers/singularity/operators/singularity.py:176: error:
Statement is unreachable  [unreachable]
[self.log.info](http://self.log.info/)("Stopping Singularity instance")

this is caused by:

def on_kill(self) -> None:
    if self.instance is not None:
        self.log.info("Stopping Singularity instance")
        self.instance.stop()

when mypy infers the type of self.instance as None, it makes the if self.instance is not None condition always false, which makes self.log.info("Stopping Singularity instance") unreachable.

fix: use self.instance: Any = None to tell mypy that self.instance can be None or any other type
note: affected # type: ignore[attr-defined] comments are removed to fix all warnings

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