[DocDB] Enable YCQL packed row in CDC DB unit tests

[rthallamko3]

Jira Link: DB-5822

Description

Commit 3d4ce59 disabled YCQL packed row for CDC tests. The tests fail with the following errors:

../../src/yb/integration-tests/cdc_service-int-test.cc:615: Failure
Value of: change_resp.has_error()
  Actual: true
Expected: false
Google Test trace:
../../src/yb/integration-tests/cdc_service-int-test.cc:613: stream_id: "4ea43c183cf14890a914db0449d858af"
tablet_id: "442d8e04f5e9449083b54d2ec72e0ffc"
from_checkpoint {
  op_id {
    term: 1
    index: 2
  }
}

Test failure stack trace:
    @        0x126e39a7d  testing::internal::TestEventRepeater::OnTestPartResult()
    @        0x126e23e1c  testing::UnitTest::AddTestPartResult()
    @        0x126e1f671  testing::internal::AssertHelper::operator=()
    @        0x10ab9a776  yb::cdc::CDCServiceTest_TestSafeTime_Test::TestBody()
    @        0x126e33aa8  testing::internal::HandleExceptionsInMethodIfSupported<>()
    @        0x126e339fd  testing::Test::Run()
    @        0x126e34b9f  testing::TestInfo::Run()
    @        0x126e358b8  testing::TestSuite::Run()
    @        0x126e45df6  testing::internal::UnitTestImpl::RunAllTests()
    @        0x126e45648  testing::internal::HandleExceptionsInMethodIfSupported<>()
    @        0x126e455cc  testing::UnitTest::Run()
    @        0x10cf7c4d1  RUN_ALL_TESTS()
    @        0x10b1863b3  main

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