monitoring(frontend): downgrade page_load_latency to warning, update next steps
Created by: bobheadxi
There seems to be some evidence that this is not really a critical issue: https://github.com/sourcegraph/sourcegraph/issues/36434#issuecomment-1144458258 For now, we should just downgrade this to a warning alert.
I've also moved the Interpretation back into the NextSteps here.
Test plan
n/a
