avoid fetching runs in runs feed if backfill filter is set and we are hiding runs within backfills

[jamiedemaria]

Summary & Motivation

If a user filters for a specific backfill in the default runs feed view, we end up making an inefficient query like this

SELECT * FROM runs
WHERE runs.backfill_id IS NULL
AND runs.backfill_id = 'abcdefgh'

This is because the default view of the Runs page excludes subruns, which is the runs.backfill_id IS NULL. This is an inefficient query and we have enough knowledge prior to running the query to know it will return no results. So we can just skip fetching runs if we see we are in this case

How I Tested These Changes

Changelog

Insert changelog entry or delete this section.

[jamiedemaria]

• avoid fetching runs in runs feed if backfill filter is set and we are hiding runs within backfills #25904 👈
• master

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[jamiedemaria]

in making the change in this PR i noticed that the filters.tags check is unnecessary since filters.tags is never None, it defaults to {}

[jamiedemaria]

when we add the option to only show backfills this condition will become more complicated and probably warrant it's own function