K8SPG-779 | allow overriding wal_level #5410

Job	Run time
runner / suggester / gofmt	6s
runner / alex	36s
runner / suggester / golangci-lint	3m 8s
runner / suggester / shfmt	11s
runner / suggester / goimports-reviser	22s
runner / manifests	2m 11s
runner / misspell	19s
runner / shellcheck	11s
	7m 4s

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