feat: add integration tests for ACK runtime reconciler

[a-hilaly]

Add integration tests that verify the core reconciliation lifecycle using the
envtest framework with a fake AWS resource manager. Inspired by kro's testing
approach, the tests validate CREATE, UPDATE, and DELETE operations, asserting
precise API call counts and operation sequences. This follows the same patterns
used by real ACK controllers like s3-controller, using BindControllerManager to
wire up the reconciler properly.

The test infrastructure includes a fake DynamoDB Table resource with realistic
fields (ProvisionedThroughput, SSESpecification, Tags, etc.) and a delta
comparison implementation matching the code-generated patterns in ACK
controllers. This provides a foundation for testing runtime behavior changes
without requiring actual AWS API calls or a real controller codebase.

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

[ack-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: a-hilaly

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[a-hilaly]

/retest

[ack-prow]

@a-hilaly: 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	06cee45	link	false	/test verify-attribution
ec2-controller-test	06cee45	link	true	/test ec2-controller-test

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