[CI] Move nightly cases to weekly and remove some nightly cases #11433

Job	Run time
doc-test	-1s
Parse trigger and determine test scope	-1s
Build nightly-a2 image	-1s
Export global env vars as job outputs	-1s
Generate accuracy test matrix	-1s
single-node	0s
single-node-accuracy-tests-pr-only	0s
single-node-accuracy-tests	0s
multi-node	0s
Merge benchmark artifacts into nightly-a2.zip	0s
clear-pre-logs	0s
	-5s

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