thanos: remove deprecated features and support for older versions #2629
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Thanos support is explicitly flagged as experimental in the documentation which states that it may change significantly without deprecation notice or backward compatibility in any release.
Thanos configuration has changed significantly throughout its early iterations. Most notably, object store configuration was replaced in v0.2.0 and gossip was deprecated in v0.4.0 (removed in v0.5.0). Retaining complete backwards compatibility in prometheus-operator for all version of thanos has unnecessarily complicated its API and implementation.
Per #2623 (comment), this drops support for older versions and simplifies the CRDs.