[Task]: Un-skip Iceberg CDC tests when Managed service gets updated to 2.77 #40732

What needs to happen?

The new CDC tests are failing for the Dataflow Managed Service test suite because the service is still at 2.76. They're getting skipped in #40731, and should be un-skipped when the service gets updated (in around a week or so).

Issue Priority

Priority: 2 (default / most normal work should be filed as P2)

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