TriggerMenuMT+TriggerJobOpts: cleanup usage of CFElements

Since we no longer support the legacy sequences, cleanup the use of CFElements:

• replace has/getProp with has/getattr
• replace getSequenceChildren with Members access (except for the cases where we rely on silent return when used on non-sequences)
• replace compName with .name

cc @tbold @fpastore

This merge request affects 2 packages:

• Trigger/TriggerCommon/TriggerJobOpts
• Trigger/TriggerCommon/TriggerMenuMT

Affected files list will not be printed in this case

Adding @fwinkl ,@shanisch ,@martindl ,@sutt ,@mark ,@fpastore ,@lidiaz as watchers

added 24.0 Trigger TriggerMenu full-unit-tests review-pending-level-1 labels

changed the description

CI Result FAILURE (hash 5dcb7d72)

	Athena
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 5405] (remote access info)

Unrelated unit test failure which should be fixed by !69283 (merged):

	1991 - TrkVertexSeedFinderTools_IndexedCrossDistancesSeedFinder_ctest (Failed)

XMLCatalog                                          ERROR Fatal Error at file "/build/ci-builds/24.0/Athena/build/Athena/Tracking/TrkVertexFitter/TrkVertexSeedFinderTools/CMakeFiles/unitTestRun/PoolFileCatalog.xml", line 1, column 1
XMLCatalog                                          ERROR Message: invalid document structure

CI failure unrelated. Approving for now. L1

added review-approved label and removed review-pending-level-1 label

Trigger-only python cleanup

added review-approved-point1 label

mentioned in commit d2fccbaa

merged

mentioned in merge request !69320 (merged)