Issue #3588206 by yas: Revert expected 'effectiveUri' in Ec2ServiceTest::testAddMockHandlerByDescribeInstances() to match AWS SDK behavior

Yas Naoirequested to merge
issue/cloud-3588206:3588206-revert-expected-effectiveuri into 8.x

Issue #3588206 by yas: Revert expected 'effectiveUri' in Ec2ServiceTest::testAddMockHandlerByDescribeInstances() to match AWS SDK behavior

Closes #3588206

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