Pass on query priority to Druid so that watermark queries are not stuck on long running queries which can hang dashboard load.

This also requires an application change to be effective for time-range-summary api should use the highest priority than all other queries, so use 50 for that.

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!