chore(velox-connector): Remove the C++ tests that were never built.

[jackluo923]

Description

Removes ClpConnectorTest.cpp, ClpConfigTest.cpp, and the 13 example archives that they read.

No CMakeLists.txt references them, so they have never been built. Wiring them up is impractical: the plugin leaves Velox symbols undefined so that the worker process resolves them at load time, which leaves a test binary with nothing to link against unless Velox is compiled into the build-env image.

Their cases are covered by the integration tests, and by the velox-connector/tests/ unit tests that this branch already carries.

Breaking changes

None.

Validation performed

git grep finds no remaining reference to the deleted files or their examples/ directory.

task velox-connector:test: 11 passed. task integration-tests:run: 24 passed, 2 xfailed.

Checklist

• The PR satisfies the contribution guidelines.
• Necessary docs have been updated, OR no docs need to be updated.
• The description has been filled out.
• The breaking changes section has been filled out.
• The validation performed section has been filled out.
• The PR title:
  • follows the Conventional Commits specification.
  • uses one of the commit types from here.
  • is in imperative form (e.g., "Add new node types.").
  • references the GitHub issues that the PR resolves (if any) using the (fixes #N) or
    (resolves #N) syntax in the title.

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