chore: Rename SD-Core charms by adding -k8s as a suffix #128

Job	Run time
lib-needs-publishing	4s
integration-test / integration-test	20m 11s
lint-report / lint-report	24s
static-analysis / static-analysis	36s
check-libraries / check-libraries	2s
unit-tests-with-coverage / unit-tests	22s
Publish Charm	0s
Publish Lib	0s
	21m 39s

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