K8SPG-995 bump version to 3.0.0 #6090

Job	Run time
runner / suggester / goimports-reviser	28s
runner / shellcheck	9s
runner / misspell	23s
runner / suggester / golangci-lint	2m 57s
runner / suggester / gofmt	10s
runner / suggester / shfmt	28s
e2e-tests release_versions image availability	13s
runner / alex	37s
runner / manifests	1m 51s
	7m 16s

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