pre-commit auto whitespace cleanup for `.pmk` files (#399)

Enforced 3 hooks for `.pmk` files:

- end-of-file-fixer
- mixed-line-ending
- trailing-whitespace

(cherry picked from commit 681bf8c045915

pre-commit auto whitespace cleanup for `.pmk` files (#399)

Enforced 3 hooks for `.pmk` files:

- end-of-file-fixer
- mixed-line-ending
- trailing-whitespace

(cherry picked from commit 681bf8c04591511021696eeecc34a88cdb90e447)

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