Fix logging for tests and examples

[EddyTheCo]

Remove the use of the LCM_LOG_DEFAULT_ENABLED compile definition. LCM_LOG has to be enable always at runtime.
Enable LCM_LOG at runtime for the tests and the example. This solves #24.

[github-actions]

🧩 Build Artifacts

✅ The following build artifacts were produced:

• GitHub Actions 1000000561

[gemini-code-assist]

Code Review

This pull request refactors the logging system by removing the compile-time definition LCM_LOG_DEFAULT_ENABLED and defaulting logging to disabled. Logging is now explicitly enabled in the connmanctl example and via a new logging_init.cpp helper for specific tests. The review feedback highlights that some test targets might now lack logging due to the removal of the global definition and suggests using the [[maybe_unused]] attribute on the static initializer in logging_init.cpp to avoid potential compiler warnings.

[github-actions]

🧩 Build Artifacts

✅ The following build artifacts were produced:

• GitHub Actions 1000000564