Alert evaluation bugfix + add average selector to alerts #7098
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What type of PR is this?
Description
This is an addition to #7076. This PR adds the ability to select the average value from a column when making an alert.
This PR also makes the alert evaluate to UNKNOWN when min, max, or avg cannot be computed for a column. For example, this will happen when the column data type is a string, and those strings can't be converted to numbers.
This PR also deletes a print statement that was accidentally left in #7076.
How is this tested?
Related Tickets & Documents
#7076
Mobile & Desktop Screenshots/Recordings (if there are UI changes)