[SPARK-54655] [SS] Reduce test time for StateStoreCoordinatorSuite

[liviazhu]

What changes were proposed in this pull request?

Reduce test time by doing the following:

• Replace Thread.sleep with eventually
• Maintenance thread pool timeout set to minimum of the timeout from SQLConf and 60 seconds
• Reduce shuffle partitions/iterations for extremely slow tests (e.g. "SPARK-51358: Snapshot uploads in $providerName are properly reported to the coordinator")

Why are the changes needed?

Test is very slow currently (>12 min)

Does this PR introduce any user-facing change?

No

How was this patch tested?

Testing only

Was this patch authored or co-authored using generative AI tooling?

No