cmake: replace deprecated remove command with rm and pass arg safely

All curl-supported CMake versions support the modern method, along with
the `--` marker.

Also:
- make sure to pass `-f` to not fail if the file is missing, as before
  this patch.
- drop now redundant `OUTPUT_QUIET`, `ERROR_QUIET` and error handling
  in `cmake_uninstall`.
- move filename to end of the error message for readability.
- GHA/linux: test these two 'clean' targets in the aws-lc job.

Refs:
https://cmake.org/cmake/help/v4.4/manual/cmake.1.html#cmdoption-cmake-E-arg-remove
https://cmake.org/cmake/help/v3.18/manual/cmake.1.html#run-a-command-line-tool

Closes #22193

tests/certs/CMakeLists.txt

@@ -39,7 +39,7 @@ if(NOT _CURL_SKIP_BUILD_CERTS)
 endif()
 
 add_custom_target(clean-certs
-  COMMAND ${CMAKE_COMMAND} -E remove ${GENERATEDCERTS}
+  COMMAND ${CMAKE_COMMAND} -E rm -f ${GENERATEDCERTS}
     "test-*.csr"
     "test-*.der"
     "test-*.keyenc"