What this PR does / why we need it:

Add command: ["redis-server", "--save", ""] to disable RDB snapshotting
in both test Redis deployments. These are ephemeral test instances — no
data needs to survive pod restarts.

Which issue(s) this PR fixes:

Redis pods on OpenShift fail with MISCONF error:

Redis is configured to save RDB snapshots, but it's currently unable
to persist to disk. Commands that may modify the data set are disabled,
because this instance is configured to report errors during writes if
RDB snapshotting fails (stop-writes-on-bgsave-error option).

This blocks all write commands during e2e and REST API integration tests,
causing materialization failures.

Checks

• I've made sure the tests are passing.
• My commits are signed off (git commit -s)
• My PR title follows conventional commits format

Testing Strategy

• Unit tests
• Integration tests
• Manual tests
• Testing is not required for this change

Misc