Re-enable pre-commit insert-license hook (another implementation).

[igorts-git]

Description

Re-enable the license inserting pre-commit hook using a different implementation.
This one is using google/addlicense hook, which is smarter than the previous implementation.
It can ignore formatting issues and won't attempt to add second license if the formatting does not match.

Tests

Manual running of pre-commit with a few locally modified files to test various scenarios, such as different space formatting, different years in the copyright string, complete removal of the license, etc.

Checklist

Before submitting this PR, please make sure (put X in square brackets):

• I have performed a self-review of my code. For an optional AI review, add the gemini-review label.
• I have necessary comments in my code, particularly in hard-to-understand areas.
• I have run end-to-end tests tests and provided workload links above if applicable.
• I have made or will make corresponding changes to the doc if needed, including adding new documentation pages to the relevant Table of Contents (toctree directive) as explained in our documentation.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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