add prompt template and context modifiers to BaseRAGQA (#7699) #867

Job	Run time
test-ubuntu / Build packages (3.10, ubuntu-22.04)	8m 11s
test-ubuntu / ubuntu-22.04 pytest	16m 53s
test-ubuntu / ubuntu-22.04 pytest	15m 47s
test-ubuntu / Notify_on_failure	0s
	40m 51s

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