ITS: GPU: added launch bounds for ITS kernels

[cima22]

Added launch bounds to ITS compute kernels. On MI50, shows speedup of 1.4 on MI50. Adjusted default block/grid sizes accordingly.

[github-actions]

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[alibuild]

Error while checking build/O2/fullCI_slc9 for a2319b2 at 2025-09-02 23:11:

++ cp /sw/slc9_x86-64/O2/14644-slc9_x86-64-local1/compile_commands.json .
+++ python3 -c 'import json, os; print(os.path.commonpath([x["file"] for x in json.loads(open("compile_commands.json").read()) if "sw/BUILD" not in x["file"] and "G__" not in x["file"] and x["file"].endswith(".cxx")]))'
++ O2_SRC=/sw/SOURCES/O2/14644-slc9_x86-64/0
++ [[ -e /sw/SOURCES/O2/14644-slc9_x86-64/0/CMakeLists.txt ]]

Full log here.