Fix sink user pipe visibility and mask credentials in SHOW CREATE PIPE

[Caideyipi]

Description

Pipe visibility

• Fix write-back sink user visibility checks to read connector/sink authentication keys instead of extractor/source keys.
• Allow associated sink users to query the pipe through SHOW PIPES and SHOW CREATE PIPE.

Credential masking

• Mask sensitive pipe attribute values in SHOW CREATE PIPE with the shared PipeParameters.ValueHider key rules.
• Cover source/sink passwords, extractor/connector aliases, and SSL credential keys.

Tests

• Update ShowCreateTaskTest to verify explicit and alias-prefixed credentials are masked.
• Extend IoTDBPipePermissionIT to verify sink-user visibility and masked SHOW CREATE PIPE output.
• Passed targeted ShowCreateTaskTest (9 tests).
• Passed Spotless for ConfigNode, DataNode, and integration-test.
• Passed Checkstyle for ConfigNode and DataNode. Integration-test standalone Checkstyle is blocked by its existing unresolved baseDir configuration.
• The targeted integration-test reactor compiled the changed production modules, but could not reach the IT on this Windows host because existing generated-file RAT/dependency-analysis failures and JVM virtual-memory exhaustion interrupted the build.

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This PR has:

• been self-reviewed.
• added or updated unit tests.
• added integration tests.

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Key changed/added classes

• PipeTableResp
• ShowCreatePipeTask
• ShowCreateTaskTest
• IoTDBPipePermissionIT