KAFKA-18424: Consider splitting PlaintextAdminIntegrationTest#testCon… #134

Job	Run time
build / Configure Workflow	2s
build / Load Test Catalog	42s
build / Compile and Check (Merge Ref)	13m 31s
build / CI checks completed	2s
build / JUnit tests Java ${{ matrix.java }}${{ matrix.run-flaky == true && ' (flaky)' \|\| '' }}${{ matrix.run-new == true && ' (new)' \|\| '' }}	-1s
build / Update Test Catalog	0s
build / Collate Test Catalog	-1s
	14m 15s

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