fix: measure IN filter flattned into invalid filter

[AdityaHegde]

When there is a measure filter as a local filter in canvas we try to 'correct' it and unintentionally flatten it leading to invalid filter.

This adds a safeguard to ensure we ignore measure filters while flattening

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!