MINOR: Rename TopicCommandTest

[jsancio]

Rename the test suite to later add unittests that don't depend on
ZK or the AdminClient TopiCommand types.

Committer Checklist (excluded from commit message)

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

[jsancio]

Here is the rename @ijuma. I'll resolve the conflicts in #8364, if any, once this is merged.

[ijuma]

LGTM

[ijuma]

ok to test

[jsancio]

One failure unrelated to this change

org.scalatest.exceptions.TestFailedException: The remaining consumers in the group could not fetch the expected records
	at org.scalatest.Assertions.newAssertionFailedException(Assertions.scala:530)
	at org.scalatest.Assertions.newAssertionFailedException$(Assertions.scala:529)
	at org.scalatest.Assertions$.newAssertionFailedException(Assertions.scala:1389)
	at org.scalatest.Assertions.fail(Assertions.scala:1091)
	at org.scalatest.Assertions.fail$(Assertions.scala:1087)
	at org.scalatest.Assertions$.fail(Assertions.scala:1389)
	at kafka.api.ConsumerBounceTest.testRollingBrokerRestartsWithSmallerMaxGroupSizeConfigDisruptsBigGroup(ConsumerBounceTest.scala:329)