fix: disable pebble health checks #310

Job	Run time
Run Tests / Lint	18s
Publish Charm / Generate the Charm Matrix	10s
Run Tests / Unit tests (katib-db-manager)	19s
Run Tests / Test the bundle	1h 25m 23s
Run Tests / Integration tests (microk8s) (katib-controller)	13m 4s
Run Tests / Check libraries (katib-controller) / Check libraries	27s
Run Tests / Check libraries (katib-controller) / Lint	11s
Run Tests / Check libraries (katib-db-manager) / Check libraries	26s
Run Tests / Check libraries (katib-ui) / Check libraries	30s
Run Tests / Check libraries (katib-db-manager) / Lint	12s
Run Tests / Check libraries (katib-ui) / Lint	15s
Publish Charm / Publish Charm (./charms/katib-controller)	4m 47s
Publish Charm / Publish Charm (./charms/katib-ui)	35m 22s
Publish Charm / Publish Charm (./charms/katib-db-manager)	32m 15s
	2h 53m 39s

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