User-configurable gpuav indices_count #15839

Job	Run time
code-format	35s
check_vvl	1s
chromium	1s
Ubuntu Backcompat	1s
all-tests-passed	3s
iOS	1s
android	1s
androidUpload	1s
linux (thread sanitizer, ${{ matrix.config }}, custom_hash_map ${{ matrix.custom_hash_map }} )	1s
mingw	1s
linux (undefined behavior sanitizer, debug)	1s
windows	1s
androidOnLinux	1s
linux (address sanitizer, ${{ matrix.config }}, custom_hash_map ${{ matrix.custom_hash_map }} )	1s
windowsUpload	1s
linux Upload	1s
	52s

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