Relax dir assertion with a new ConfigGetDirResponseAssertion

[andy1li]

Note

Introduce a CONFIG GET dir response assertion that tolerates an optional trailing slash and update the RDB config test to use it.

• Assertions:
  • Add ConfigGetDirResponseAssertion to validate CONFIG GET dir responses, accepting "dir" key and directory value with optional trailing slash.
• Tests:
  • Update internal/test_rdb_config.go to use NewConfigGetDirResponseAssertion(tmpDir) instead of ordered bulk string array assertion.

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[andy1li]

Thanks to @OlaoluwaM for highlighting the issue!