fix(discovery): prevent the manager from storing stale targetGroups #25

Job	Run time
Go tests	16m 31s
More Go tests	12m 10s
Go tests with previous Go version	7m 33s
Mixins tests	2m 12s
UI tests	4m 38s
Go tests on Windows	9m 43s
Build Prometheus for common architectures	0s
Build Prometheus for all architectures (0)	6m 30s
Build Prometheus for all architectures (1)	8m 34s
Build Prometheus for all architectures (2)	6m 8s
Check generated parser	12s
Build Prometheus for all architectures (3)	8m 36s
fuzzing	0s
Build Prometheus for all architectures (4)	6m 14s
golangci-lint	3m 0s
Build Prometheus for all architectures (5)	8m 41s
Build Prometheus for all architectures (6)	8m 37s
Build Prometheus for all architectures (7)	6m 8s
Build Prometheus for all architectures (8)	8m 53s
Build Prometheus for all architectures (9)	8m 19s
Build Prometheus for all architectures (10)	8m 23s
Build Prometheus for all architectures (11)	8m 55s
codeql / Analyze (javascript)	3m 59s
Publish UI on npm Registry	1m 29s
Report status of build Prometheus for all architectures	0s
Publish main branch artifacts	1m 35s
Publish release artefacts	0s
	2h 37m 0s

Provide feedback