LRS_LOG_LEVEL fix; enable log optimizations

[maloel]

LRS_LOG_LEVEL wasn't creating log files because of a bug (since #11186, 8-Dec'22) leaving the log filename empty. Tracked on [LRS-1125].

Also, PR #12959 optimizations were actually not working: all the levels were still enabled even if to-console and to-file were off! This disables unused log levels and the optimization actually works.

[maloel]

Manual LibCI run:
https://rsjenkins.iil.intel.com/job/LRS_libci_pipeline/8352/

[Nir-Az]

Will a file be generated now if the user set the env var?
Can you change the GHA log path to see if now we detect a file?
https://github.com/IntelRealSense/librealsense/blob/ff8a9fb213ec1227394de4060743b0ed61171985/.github/workflows/buildsCI.yaml#L303
should be probably:
path: build/${{env.LRS_RUN_CONFIG}}/*.log

and
https://github.com/IntelRealSense/librealsense/blob/ff8a9fb213ec1227394de4060743b0ed61171985/.github/workflows/buildsCI.yaml#L465

Should be
path: build/${{env.LRS_BUILD_CONFIG}}/*.log

[maloel]

Will a file be generated now if the user set the env var?

Yes, I tested this.

[maloel]

Log files are there now