Minimize Test Suite calls to TestHelper.enableSchemaTableCdc

As our SQL Server test suite has continued to grow, the duration of the test execution for the connector has grown substantially, currently being one of the longest-running test suites across our entire project. In the long term, this isn't sustainable.

Looking at the time spent per stage in a standard SQL Server test, there are approximately 5-8 seconds consumed when executing the following SQL:

    private static final String ENABLE_TABLE_CDC = "IF EXISTS(select 1 from sys.tables where name = '#' AND is_tracked_by_cdc=0)\n"
            + "EXEC sys.sp_cdc_enable_table @source_schema = N'%', @source_name = N'#', @role_name = NULL, @supports_net_changes = 0";

If this happens within a beforeEach or within each annotated test method, this can add up to substantial time wasted.

I'd propose to see whether we can find a solution to either reduce the time consumed by the sp_cdc_enable_table stored procedure or we re-evaluate the layout of our tests to minimize the number of times this function is called.