Make object tabs extendable via plugins (#896) #3014

Job	Run time
Build backend e2e test image	2m 12s
Build frontend e2e test image	3m 14s
lint_core	12s
Build frontend unit test image	1m 50s
Lint mwdb-core web sources	50s
Build mwdb-core core image	3m 6s
Build mwdb-core web image	1m 10s
Perform frontend unit tests	33s
Perform frontend e2e tests	3m 22s
Perform backend e2e tests	4m 40s
Push images on Docker Hub	5m 5s
Push test images on Docker Hub	1m 23s
	27m 37s

Provide feedback