Refining compiler warnings to detect race conditions

Fabian Reisterrequested to merge
feature/enabled-compiler-warning-to-detect-unused-results into master
  • adding -Werror=unused-result to ensure that, e.g., lock_guards without variable names are not being optimized out.

This is enabled by default on GCC 14 (Ubuntu 24) and revealed race conditions such as in robot-api@2772f062

/cc @dreher

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