TrigGpuTest fixes

Fix test definition now that threads must be set explicitly (!65066 (merged)). Install tests.

Improve error diagnostics if CUDA fails. Example output:

TrigInDetAccelerationSvc                       0    INFO TrigInDetAccelerationSvc: initialize
ERROR: CUDA driver version is insufficient for CUDA runtime version
No CUDA devices found
TrigInDetAccelerationSvc                       0    INFO OffloadFactory config failed
TrigFastTrackFinder_beamSpot                   0   ERROR TrigFastTrackFinder/src/TrigFastTrackFinder.cxx:250 (StatusCode TrigFastTrackFinder::initialize()): code FAILURE: m_accelSvc->isReady()

Closes ATR-28368

changed the description

This merge request affects 2 packages:

• Trigger/TrigAccel/TrigGpuTest
• Trigger/TrigAccel/TrigInDetCUDA

Affected files list will not be printed in this case

Adding @sutt ,@nagano ,@keli as watchers

added Trigger main review-pending-level-1 labels

CI Result SUCCESS (hash 83384b3d)

	Athena
externals
cmake
make
tests

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For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 79326]

Changes look fine and the CI is good. Approving. Clara (L1)

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

merged

mentioned in commit 24e0f1c3

added sweep:ignore label