[PWGDQ] add match attempts in ML training data producer

[aferrero2707]

The number of match attempts is currently the best estimator of the multiplicity of MFT tracks that are combined with each MCH track when the global muon matching is performed.

[github-actions]

O2 linter results: ❌ 37 errors, ⚠️ 10 warnings, 🔕 0 disabled

[alibuild]

Error while checking build/O2Physics/code-check for 25b6a9a at 2026-07-27 20:38:

## sw/BUILD/O2Physics-latest/log
2026-07-27T20:25:48.232+0200 [24:140556694051392] [buildboxcommon_grpcretrier.cpp:177] [ERROR] Retry limit (0) exceeded for "ActionCache.GetActionResult()", last gRPC error was [14: failed to connect to all addresses; last error: UNKNOWN: ipv4:127.0.0.1:8980: Failed to connect to remote host: Connection refused]
2026-07-27T20:25:48.232+0200 [24:140556694051392] [executioncontext.cpp:544] [ERROR] Error while querying action cache at "http://localhost:8980": 14: failed to connect to all addresses; last error: UNKNOWN: ipv4:127.0.0.1:8980: Failed to connect to remote host: Connection refused
2026-07-27T20:27:39.623+0200 [24:140556694051392] [buildboxcommon_grpcretrier.cpp:177] [ERROR] Retry limit (0) exceeded for "FindMissingBlobs()", last gRPC error was [14: failed to connect to all addresses; last error: UNKNOWN: ipv6:%5B::1%5D:8980: Failed to connect to remote host: Connection refused]
2026-07-27T20:25:48.116+0200 [23:140449711188544] [buildboxcommon_grpcretrier.cpp:177] [ERROR] Retry limit (0) exceeded for "ActionCache.GetActionResult()", last gRPC error was [14: failed to connect to all addresses; last error: UNKNOWN: ipv4:127.0.0.1:8980: Failed to connect to remote host: Connection refused]
2026-07-27T20:25:48.117+0200 [23:140449711188544] [executioncontext.cpp:544] [ERROR] Error while querying action cache at "http://localhost:8980": 14: failed to connect to all addresses; last error: UNKNOWN: ipv4:127.0.0.1:8980: Failed to connect to remote host: Connection refused
2026-07-27T20:30:33.009+0200 [23:140449711188544] [buildboxcommon_grpcretrier.cpp:177] [ERROR] Retry limit (0) exceeded for "FindMissingBlobs()", last gRPC error was [14: failed to connect to all addresses; last error: UNKNOWN: ipv6:%5B::1%5D:8980: Failed to connect to remote host: Connection refused]


## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 7 errors and 5 warnings.'
Found 7 errors and 5 warnings.
++ [[ 7 -gt 0 ]]
++ cat /sw/BUILD/439fce89081266f074f386fae68eab2c4e2c8d96/O2Physics-code-check/errors.txt
PWGDQ/Tasks/mftMchMatcher.cxx:219:8: error: constructor does not initialize these fields: ccdbManager [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Tasks/mftMchMatcher.cxx:261:3: error: initial values in enum 'mftMchMatcher::MuonMatchType' are not consistent, consider explicit initialization of all, none or only the first enumerator [readability-enum-initial-value,-warnings-as-errors]
PWGDQ/Tasks/mftMchMatcher.cxx:321:14: error: redundant boolean literal in conditional return statement [readability-simplify-boolean-expr,-warnings-as-errors]
PWGDQ/Tasks/mftMchMatcher.cxx:388:14: error: redundant boolean literal in conditional return statement [readability-simplify-boolean-expr,-warnings-as-errors]
PWGDQ/Tasks/mftMchMatcher.cxx:623:16: error: no header providing "std::fabs" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGDQ/Tasks/mftMchMatcher.cxx:663:15: error: loop variable is copied but only used as const reference; consider making it a const reference [performance-for-range-copy,-warnings-as-errors]
PWGDQ/Tasks/mftMchMatcher.cxx:693:18: error: slicing object from type 'GlobalFwdTrack' to 'TrackParCovFwd' discards 40 bytes of state [cppcoreguidelines-slicing,-warnings-as-errors]
++ [[ 5 -gt 0 ]]
++ cat /sw/BUILD/439fce89081266f074f386fae68eab2c4e2c8d96/O2Physics-code-check/warnings.txt
PWGDQ/Tasks/mftMchMatcher.cxx:337:35: warning: statement should be inside braces [readability-braces-around-statements]
PWGDQ/Tasks/mftMchMatcher.cxx:377:35: warning: statement should be inside braces [readability-braces-around-statements]
PWGDQ/Tasks/mftMchMatcher.cxx:397:38: warning: statement should be inside braces [readability-braces-around-statements]
PWGDQ/Tasks/mftMchMatcher.cxx:526:30: warning: statement should be inside braces [readability-braces-around-statements]
PWGDQ/Tasks/mftMchMatcher.cxx:546:38: warning: statement should be inside braces [readability-braces-around-statements]
++ [[ 7 -gt 0 ]]
++ exit 1
--

Full log here.