ITS tracking: Introduce configurable minimum pt per track length

[mpuccio]

The changes introduce a configurable minimum PT value per track length in the ITS tracking parameters. This allows for more fine-grained control over the minimum PT requirement, which can be useful for different tracking scenarios.

The main changes are:

• Modify the TrackingParameters struct to include an array of 4 minimum PT values, one for each track length (7, 6, 5, 4).
• Update the track fitting logic in TrackerTraits::findRoads() to use the appropriate minimum PT value based on the track length.
• Update the default minimum PT value in TrackingInterface::initialise() to use the new array-based approach.

These changes provide more flexibility in tuning the ITS tracking parameters.

[github-actions]

REQUEST FOR PRODUCTION RELEASES:
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async-2024-ppRef-apass1

[alibuild]

Error while checking build/O2/fullCI for 6450331 at 2024-12-12 14:09:

## sw/BUILD/O2-latest/log
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'


## sw/BUILD/O2Physics-latest/log
/sw/SOURCES/O2Physics/13792-slc8_x86-64/0/Common/TableProducer/Converters/trackQA002Converter.cxx:25:32: error: 'tracksQA_000' was not declared in this scope; did you mean 'tracksQA_002'?
/sw/SOURCES/O2Physics/13792-slc8_x86-64/0/Common/TableProducer/Converters/trackQA002Converter.cxx:59:32: error: 'tracksQA_001' was not declared in this scope; did you mean 'tracksQA_002'?
ninja: build stopped: subcommand failed.

Full log here.

[mconcas]

failures are unrelated. Merging