fix rescale configs

[KevBrowne]

Overview

Ran into issue when testing rescale

Issue

2026-01-08 19:22:50,394 INFO  com.pinterest.flink.streaming.connectors.psc.table.PscDynamicTableFactory [] - scan.parallelism configured: 100 (will override partition-based parallelism)
2026-01-08 19:22:50,462 WARN  com.pinterest.flink.streaming.connectors.psc.table.PscTableCommonUtils [] - scan.enable-rescale is true, but partition count could not be determined. Rescale will not be applied.

We are unable to create a Metadata client, which fails at
Invalid metadataClient configuration

Solution

we need to set PSC_METADATA_CLIENT_ID similar to how PscSourceEnumerator.java calls the PscMetadataClient

Test Plan

$psc  mvn -pl psc-flink test -Dtest=PscTableCommonUtilsTest,PscDynamicTableFactoryTest -Dgpg.skip=true -Djacoco.skip=true 2>&1 | tail -10
[INFO] Results:
[INFO] 
[INFO] Tests run: 86, Failures: 0, Errors: 0, Skipped: 0
[INFO] 
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  22.529 s
[INFO] Finished at: 2026-01-12T18:23:37-05:00
[INFO] -------------------------------------------------