Enhance TDS Login ClientInterfaceName field with client info (#3149)

- Moved logic to build client interface name into its own ClientInterface class.
- Added tests for ClientInterface.
- Reverted changes to Application Name.
- Removed unnecessary SQP_PROVIDER_NAME constant.

Author: paulmedynski

src/Microsoft.Data.SqlClient/netcore/src/Microsoft.Data.SqlClient.csproj

@@ -155,6 +155,9 @@
     <Compile Include="$(CommonSourceRoot)Microsoft\Data\SqlClient\AzureAttestationBasedEnclaveProvider.cs">
       <Link>Microsoft\Data\SqlClient\AzureAttestationBasedEnclaveProvider.cs</Link>
     </Compile>
+    <Compile Include="$(CommonSourceRoot)Microsoft\Data\SqlClient\ClientInterface.cs">
+      <Link>Microsoft\Data\SqlClient\ClientInterface.cs</Link>
+    </Compile>
     <Compile Include="$(CommonSourceRoot)Microsoft\Data\SqlClient\ColumnEncryptionKeyInfo.cs">
       <Link>Microsoft\Data\SqlClient\ColumnEncryptionKeyInfo.cs</Link>
     </Compile>

src/Microsoft.Data.SqlClient/netfx/src/Microsoft.Data.SqlClient.csproj

@@ -373,6 +373,9 @@
     <Compile Include="$(CommonSourceRoot)Microsoft\Data\SqlClient\AzureAttestationBasedEnclaveProvider.cs">
       <Link>Microsoft\Data\SqlClient\AzureAttestationBasedEnclaveProvider.cs</Link>
     </Compile>
+    <Compile Include="$(CommonSourceRoot)Microsoft\Data\SqlClient\ClientInterface.cs">
+      <Link>Microsoft\Data\SqlClient\ClientInterface.cs</Link>
+    </Compile>
     <Compile Include="$(CommonSourceRoot)Microsoft\Data\SqlClient\ColumnEncryptionKeyInfo.cs">
       <Link>Microsoft\Data\SqlClient\ColumnEncryptionKeyInfo.cs</Link>
     </Compile>