fix: export on certificate adoption

[alexwang0311]

Issue #, if available:
aws-controllers-k8s/community#2825.

Description of changes:
See related ack runtime and code generator changes:

1. runtime: feat: add hook into resource adoption runtime#232
2. code-generator: feat: add hook into resource adoption code-generator#680

Currently acm-controller relies on a state transition out of a null state to export on resource creation (IssuedAt changes from null to non-null). However, when a certificate is adopted, the reconciler skips this null state transition. In general, if a controller has custom logic that depends on a transition into or out of a null state, it won't work when the resource is adopted since the resource won't have a null state (i.e. when services.k8s.aws/deletion-policy: retain, the delete code path is skipped by the ack runtime, which skips a potential transition into a null state for a custom resource).

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ack-prow]

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[ack-prow]

Hi @alexwang0311. Thanks for your PR.

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