Fix Tests to use connection string builder

[Wraith2]

A couple of tests were using string concatenation to enable encryption on the connection string. This is ok unless your connection string isn't semicolon terminated, In that case the test fails with this sort of error:

  X Microsoft.Data.SqlClient.ManualTesting.Tests.AlwaysEncrypted.ApiShould.TestSqlDataAdapterFillDataTable [34ms]
  Error Message:
   System.ArgumentException : Invalid value for key 'connect timeout'.
---- System.FormatException : Input string was not in a correct format.
  Stack Trace:

This fixes the tests that do this by using a connection string builder as is used elsewhere in the tests to change connection properties.

[David-Engel]

LGTM