Search Jobs: expand acceptable timing windows for job tests

Created by: camdencheek

This should help stabilize these tests in CI. Timing-based tests on CI are much less consistent than locally. This expands the range of acceptable time ranges to hopefully make them more stable. In the ideal world, these tests would not depend on timings at all. However, they currently cover the "is my and/or job actually streaming" question, which is a valuable thing to test. If these continue to be problematic, (and probably eventually anyways), I'll move testing to the more deterministic merger type.

Test plan

This PR only updates tests.