Increase thoroughness of Composition conformance tests

[negz]

What problem are you facing?

We need to ensure distributions of Crossplane provide conformant support for Composition.

How could conformance help solve your problem?

We could add increase the thoroughness of tests for Composition. We should at a minimum test that:

• Well formed XRDs become established and offered when they're installed.
• XRDs define cluster scoped XRs and namespace scoped XRCs.
• Creating an XRC creates a corresponding XR and composes resources per the Composition used.
• XRs and XRCs write their connection secrets as instructed.

We may also want to test that:

• Selecting compositions works as intended.
• Enforcing and defaulting compositions works as intended.
• Both anonymous and named composition templates work as intended.
• All supported patch and transform types work as intended.

[stale]

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