Update some docs still referencing Sputnik and JUnit runner and clarify situation of Jupiter extensions #2333

Job	Run time
Check YAML consistency	47s
Check all Workflow YAML Consistency	1m 26s
Build and Verify (3.0, 8, ubuntu-latest)	1m 5s
Build and Verify (2.5, 8, ubuntu-latest)	1m 8s
Build and Verify (3.0, 17, ubuntu-latest)	1m 2s
Build and Verify (4.0, 11, ubuntu-latest)	1m 7s
Build and Verify (2.5, 11, ubuntu-latest)	1m 3s
Build and Verify (3.0, 21, ubuntu-latest)	1m 16s
Build and Verify (4.0, 25, ubuntu-latest)	1m 2s
Build and Verify (4.0, 21, ubuntu-latest)	1m 7s
Build and Verify (4.0, 8, ubuntu-latest)	1m 8s
Build and Verify (3.0, 11, ubuntu-latest)	1m 4s
Build and Verify (3.0, 25, ubuntu-latest)	1m 3s
Build and Verify (4.0, 17, ubuntu-latest)	1m 5s
Build and Verify (4.0, 8, windows-latest)	1m 45s
Build and Verify (3.0, 8, macos-latest)	1m 13s
Build and Verify (4.0, 8, macos-latest)	1m 31s
Build and Verify (2.5, 8, macos-latest)	1m 15s
Build and Verify (5.0, 11, windows-latest)	2m 16s
Build and Verify (5.0, 21, ubuntu-latest)	1m 9s
Build and Verify (5.0, 11, macos-latest)	1m 26s
Build and Verify (5.0, 17, ubuntu-latest)	1m 1s
Build and Verify (5.0, 11, ubuntu-latest)	57s
Build and Verify (5.0, 25, ubuntu-latest)	1m 7s
Build and Verify (3.0, 8, windows-latest)	1m 45s
Build and Verify (2.5, 8, windows-latest)	1m 58s
	32m 46s

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