chore: Use client instead of APIReader + Add observedGeneration to status Conditions

[michaelhtm]

Description of changes: Currently in ACK, at the beginning of the Reconciler for each event, we get the resource from the k8s APIServer. This is an unecessary call, as the latest object that triggered the reconciler is already stored in the informers cache.

With this change, we will be retrieving the resource from the cache instead of the APIServer.

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

[ack-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: michaelhtm

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[michaelhtm]

/test iam-controller-test

[michaelhtm]

/test s3-controller-test

[michaelhtm]

/test sagemaker-controller-test

[michaelhtm]

/hold

[a-hilaly]

This PR should be release along with the observed generation condition work

[michaelhtm]

/retest

[ack-prow[bot]]

@michaelhtm: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
verify-attribution	73efccc7d7aae86720a2bd1a278757f7f17aebc0	link	false	/test verify-attribution
sqs-controller-test	73efccc7d7aae86720a2bd1a278757f7f17aebc0	link	true	/test sqs-controller-test

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