Add a startup extension so main stops calling into pkg/enterprise - #5237
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The variant's API checks, cluster state verification, protected namespaces, tenancy and cloud build flag now register through pkg/extensions, and the extensions arrive as a factory the operator calls once it resolves the variant.
The shared factory type only pays off once both variants call a common entry point, which the mono repo merge has not settled yet.
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Description
The operator's startup path calls into the Enterprise package directly for several things. Those go through the extensions boundary here instead, via a new startup slot that no-ops when nothing registers.
cmd/main.gobuilds the extensions once it has a client and has read the variant off the Installation, which leaves it naming a variant in exactly one place.Behavior is unchanged with two exceptions worth calling out. The protected namespaces were already applied whatever the variant, so the startup extension registers for every variant and skips the checks that only apply to Enterprise. The version banner prints the build variant it was given rather than a hardcoded product name, so a cloud build reports "cloud"; the line the release tooling parses for the operator version is untouched.
Related: CORE-13420