reject queries without from clause

[k-anshul]

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!

[nishantmonu51]

Approving, but nit: I have used this to test connectivity in the past, any reason for disallowing it ? Does it not work anymore ?

[k-anshul]

Approving, but nit: I have used this to test connectivity in the past, any reason for disallowing it ? Does it not work anymore ?

@nishantmonu51 AFAIK select 1 kind of statements never worked using metrics sql because the first step is to identify the metrics view from the from clause.
Did you by chance used normal SQL API instead of metrics sql ?