Adds release CI and refactors the existing workflows. #987

Job	Run time
build / build	4m 41s
agent / agent	4m 39s
extensions / jupyterlab	2m 33s
web / web	3m 11s
bats / docker	1m 23s
bats / native (macos-latest)	20s
cypress / native (macos-latest)	2m 16s
bats / native (windows-latest)	1m 26s
cypress / native (windows-latest)	4m 20s
bats / native (ubuntu-latest)	14s
cypress / native (ubuntu-latest)	37s
	25m 40s

Provide feedback