feat: add global OpenSearch index prefix support (#8489) #14386

Job	Run time
Pylint for Python 2.7 in Pilot files	54s
pre-commit	1m 5s
check-py314 (pytest --runslow -k 'not test_BaseType_Unicode and not test_nestedStructure')	13m 27s
check-py314 (pylint -j 0 -E src/)	3m 23s
check (pylint -j 0 -E src/)	3m 31s
pycodestyle	7s
shellcheck	8s
check (mypy)	2m 25s
check (pytest --runslow -k 'not test_BaseType_Unicode and not test_nestedStructure')	13m 59s
DiracX Unit Tests	2m 12s
	41m 11s

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