K8SPG-1011 pgbackrest image no longer required when backups are disabled #5981

Job	Run time
runner / suggester / goimports-reviser	28s
runner / misspell	18s
runner / suggester / gofmt	8s
runner / suggester / shfmt	24s
runner / shellcheck	12s
runner / manifests	1m 46s
e2e-tests release_versions image availability	12s
runner / alex	29s
runner / suggester / golangci-lint	3m 4s
	7m 1s

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