APIE-1043: Remove broken RTCE topic live test.

[Kostya Linou (linouk23)]

Bug Fixes

• Fix broken live_test,all build by removing the RTCE topic live test that referenced undefined identifiers.

Checklist

• I have successfully built and used a custom CLI binary, without linter issues from this PR.
• I have clearly specified in the What section below whether this PR applies to Confluent Cloud, Confluent Platform, or both.
• I have verified this PR in Confluent Cloud pre-prod or production environment, if applicable.
• I have verified this PR in Confluent Platform on-premises environment, if applicable.
• I have attached manual CLI verification results or screenshots in the Test & Review section below.
• I have added appropriate CLI integration or unit tests for any new or updated commands and functionality.
• I confirm that this PR introduces no breaking changes or backward compatibility issues.
• I have indicated the potential customer impact if something goes wrong in the Blast Radius section below.

What

Applies to: Confluent Cloud.

test/live/rtce_topic_live_test.go (added in #3331 alongside the RTCE control plane commands) references bare region and topicName identifiers that are not declared anywhere in the live test package. As a result, the
live test target fails to compile under the live_test,all build tags (and under live_test,rtce), blocking every live-test group that includes this file.

This PR deletes the broken file so the live-test suite builds and runs again. The corresponding unit/integration tests and mock handlers for RTCE (test/rtce_topic_test.go, test/test-server/rtce_topic_handler.go) are
unchanged. The live test can be reintroduced in a follow-up once the missing test variables/fixtures are added.

Blast Radius

No customer impact — this PR only touches a live_test-tagged file under test/live/ and does not change any shipped CLI code. The only effect is that the RTCE-topic live test no longer runs; coverage for RTCE remains via
the existing unit and integration tests.

[confluent-cla-assistant]

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Pull request overview

This PR removes a broken RTCE topic live test so the live_test,all and live_test,rtce test targets can compile again without changing shipped CLI behavior.

Changes:

• Deletes test/live/rtce_topic_live_test.go, which referenced undefined region and topicName identifiers.
• Leaves existing RTCE mock/integration coverage unchanged.

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