Update of FTAG ART tests

• Make test_FTAG_grid test executable. Should hopefully solve

2023-12-21 04:27:53,611        art.grid.job                ERROR T00 /cvmfs/atlas-nightlies.cern.ch/repo/sw/main_Athena_x86_64-el9-gcc13-opt/2023-12-20T2101/Athena/24.0.20/InstallArea/x86_64-el9-gcc13-opt/src/PhysicsAnalysis/JetTagging/FlavourTaggingTests/test/test_FTAG_grid.sh is NOT executable.

• Drop tight memory requirement on test_FTAG_AOD_withtrackless_grid.sh which probably prevented to find any running site since introduced

FYI @bdong @ligang

PhysicsAnalysis/JetTagging/FlavourTaggingTests/test/test_FTAG_AOD_withtrackless_grid.sh

@@ -3,7 +3,6 @@
 #
 # art-description: RDO to AOD step with trackless b-tagging for Run 3 MC 
 # art-type: grid
-# art-memory: 4096
 # art-include: main/Athena
 # art-output: *.pool.root
 # art-output: *.log