ITS: cleanup unused classes

[f3sch]

removes unused code.
The only one I am not sure about is the smoother but then this was never really used, right @mconcas ?

[github-actions]

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[alibuild]

Error while checking build/O2/fullCI_slc9 for 3b5aa45 at 2025-07-12 14:09:

## sw/BUILD/84310d851b80ba544e887f584bfbd4311fb46a93-latest/log
/sw/SOURCES/O2/14504-slc9_x86-64/0/Detectors/ITSMFT/ITS/tracking/include/ITStracking/Smoother.h:20:10: fatal error: ITStracking/ROframe.h: No such file or directory
ninja: build stopped: subcommand failed.


## sw/BUILD/O2-latest/log
/sw/SOURCES/O2/14504-slc9_x86-64/0/Detectors/ITSMFT/ITS/tracking/include/ITStracking/Smoother.h:20:10: fatal error: ITStracking/ROframe.h: No such file or directory
ninja: build stopped: subcommand failed.

Full log here.

[alibuild]

Error while checking build/O2/fullCI_slc9 for e2b719e at 2025-07-15 08:56:

No log files found

Full log here.

[f3sch]

@mconcas are you fine merging these changes?

[mconcas]

@mconcas are you fine merging these changes?

Yes, but I'd not squash it.

[f3sch]

indeed, @shahor02 could you please merge this, but please do not squash.

[f3sch]

ah thanks, sorry did not know you can merge for files you are not code owner of.