KAFKA-9949: Fix Flaky GlobalKTableIntegrationTest

[guozhangwang]

Following similar idea as in #8600 , check for all key-value pairs in the global store before proceeding to check for join results.

Committer Checklist (excluded from commit message)

• Verify design and implementation
• Verify test coverage and CI build status
• Verify documentation (including upgrade notes)

[guozhangwang]

@mjsax

[mjsax]

Java 14 passed. Java 8 and Java11 failed with know flaky test EosBetaUpgradeIntegrationTest.

[mjsax]

Merged to trunk. No error were reported for older branches so far. We can cherry-pick later if needed.