Implement the pylint rule PLW1514 (unspecified-encoding) (#7939)
## Summary
Implemented the pylint rule W1514 ( unspecified-encoding).
See also:
https://pylint.readthedocs.io/en/latest/user_guide/messages/warning/unspecified-encoding.html
## Test Plan
Tested it with the submitted test case.
Additionally, we tested the new ruff rule (PLW1514) on our proprietary
Python code base.
