SFI: More ROPC fixes

[gewarren]

Related to #10342.

• Delete unneeded connection strings.
• Delete some unsafe examples for older (System.Web) APIs.
• Delete PII from DataSource names in connection strings.

(Hide whitespace changes.)

[ghost]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[ghost]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[learn-build-service-prod]

Learn Build status updates of commit 6fa2308:

✅ Validation status: passed

File	Status	Preview URL	Details
snippets/csharp/System.Data/EntityKey/Overview/app.config	✅Succeeded
snippets/csharp/System.IdentityModel.Services/SessionAuthenticationModule/Overview/web.config.backup.1	✅Succeeded	n/a (file deleted or renamed)
snippets/csharp/System.IdentityModel.Services/SignInRequestMessage/Overview/web.config.backup.1	✅Succeeded	n/a (file deleted or renamed)
snippets/csharp/System.IdentityModel.Services/WSFederationAuthenticationModule/Overview/web.config.backup.1	✅Succeeded	n/a (file deleted or renamed)
snippets/csharp/System/Random/Overview/project.csproj	✅Succeeded
snippets/csharp/VS_Snippets_ADO.NET/Classic WebData OdbcCommand/CS/source.cs	✅Succeeded	View
snippets/csharp/VS_Snippets_ADO.NET/Classic WebData OdbcConnection.BeginTransaction/CS/source.cs	✅Succeeded	View
snippets/csharp/VS_Snippets_ADO.NET/Classic WebData OdbcConnection.BeginTransaction1/CS/source.cs	✅Succeeded	View
snippets/csharp/VS_Snippets_ADO.NET/Classic WebData OdbcConnection.Close/CS/source.cs	✅Succeeded	View
snippets/csharp/VS_Snippets_ADO.NET/Classic WebData OdbcConnection/CS/source.cs	✅Succeeded	View
snippets/csharp/VS_Snippets_ADO.NET/Classic WebData OdbcDataAdapter.DeleteCommand/CS/source.cs	✅Succeeded	View
snippets/csharp/VS_Snippets_ADO.NET/Classic WebData OdbcDataAdapter.InsertCommand/CS/source.cs	✅Succeeded	View
snippets/csharp/VS_Snippets_ADO.NET/Classic WebData OdbcDataAdapter.OdbcDataAdapter/CS/source.cs	✅Succeeded	View
snippets/csharp/VS_Snippets_ADO.NET/Classic WebData OdbcDataAdapter.OdbcDataAdapter1/CS/source.cs	✅Succeeded	View
snippets/csharp/VS_Snippets_ADO.NET/Classic WebData OdbcDataAdapter.OdbcDataAdapter2/CS/source.cs	✅Succeeded	View
snippets/csharp/VS_Snippets_ADO.NET/Classic WebData OdbcDataAdapter.OdbcDataAdapter3/CS/source.cs	✅Succeeded	View
snippets/csharp/VS_Snippets_ADO.NET/Classic WebData OdbcDataAdapter.SelectCommand/CS/source.cs	✅Succeeded	View
snippets/csharp/VS_Snippets_ADO.NET/Classic WebData OdbcDataAdapter.UpdateCommand/CS/source.cs	✅Succeeded	View
snippets/csharp/VS_Snippets_ADO.NET/Classic WebData OdbcDataAdapter/CS/source.cs	✅Succeeded	View
snippets/csharp/VS_Snippets_ADO.NET/Classic WebData OdbcParameter/CS/source.cs	✅Succeeded	View
snippets/csharp/VS_Snippets_ADO.NET/Classic WebData OleDbCommand.ExecuteNonQuery Example/CS/source.cs	✅Succeeded	View
snippets/csharp/VS_Snippets_ADO.NET/Classic WebData OleDbCommand.Prepare Example/CS/source.cs	✅Succeeded	View
snippets/csharp/VS_Snippets_ADO.NET/Classic WebData OleDbDataReader.GetOrdinal/CS/source.cs	✅Succeeded	View
snippets/csharp/VS_Snippets_ADO.NET/Classic WebData OleDbParameter Example/CS/source.cs	✅Succeeded	View
snippets/csharp/VS_Snippets_ADO.NET/Classic WebData SqlCommand Example/CS/source.cs	✅Succeeded	View

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[gewarren]

Closing as this PR got too big. Will break it up.