upgrade/upgrades: fix TestUpgradeSchemaChangerElements race condition #100598
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Previously, TestUpgradeSchemaChangerElements started a schema change
and intentionally caused it to be paused. It then resumed this job
and started a version upgrade. The version upgrade being tested is
meant to pause schema change jobs intentionally, which could lead
to the job getting paused again before it resumed. This patch, adds
one more channel to ensure synchronization in this sequence.
Additionally, we will further limit the scope of version to make
this test a bit shorter, so that we are only focused on the upgrade
for schema changes
Fixes: #98062.
Release note: None