Update to semaphore-compat 2.0.0 using v2 of the protocol

Zubinrequested to merge
wip/semaphore-v2 into master

Update to semaphore-compat 2.0.0 using v2 of the protocol

Also ensure backwards compatibility with older/newer version of the protocol, by means of graceful degradating to -j1 with a warning.

For more details on backwards compatibility, see the accompanying MR to semaphore-compat semaphore-compat!8 (merged).

Fixes #25087 (closed)

Edited by sheaf

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