SFI: ROPC fixes for System.Web

[gewarren]

Contributes to #10434.

In most cases, insecure examples were deleted.

Hide whitespace changes in diff.

[dotnet-issue-labeler]

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.

[dotnet-issue-labeler]

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[learn-build-service-prod]

Learn Build status updates of commit ffe1d32:

✅ Validation status: passed

File	Status	Preview URL	Details
snippets/csharp/VS_Snippets_WebNet/FormsAuthenticationHashPassword/CS/formsauthenticationhashpasswordcs.aspx	✅Succeeded	n/a (file deleted or renamed)
snippets/csharp/VS_Snippets_WebNet/System.Web.Management.SqlServices/CS/usingsqlservices.cs	✅Succeeded	n/a (file deleted or renamed)
snippets/csharp/VS_Snippets_WebNet/System.Web.Security.IMembershipProvider/CS/imembershipprovider.cs	✅Succeeded	n/a (file deleted or renamed)
snippets/csharp/VS_Snippets_WebNet/System.Web.Security.IMembershipProvider/CS/imembershipprovidergetallusers.cs	✅Succeeded	n/a (file deleted or renamed)
snippets/csharp/VS_Snippets_WebNet/System.Web.Security.MembershipUser.Constructor/CS/newuser.cs	✅Succeeded	n/a (file deleted or renamed)
snippets/csharp/VS_Snippets_WebNet/System.Web.UI.WebControls.ChangePassword.OnChangingPassword/CS/changepassword_cs.aspx	✅Succeeded	n/a (file deleted or renamed)
snippets/csharp/VS_Snippets_WebNet/System.Web.UI.WebControls.ChangePassword/CS/changepassword_cs.aspx	✅Succeeded	n/a (file deleted or renamed)
snippets/csharp/VS_Snippets_WebNet/System.Web.UI.WebControls.ParameterCollection_2/CS/paramcoll2cs.aspx	✅Succeeded	n/a (file deleted or renamed)
snippets/csharp/VS_Snippets_WebNet/System.Web.UI.WebControls.SendMailErrorEventHandler/CS/changepassword_cs.aspx	✅Succeeded	n/a (file deleted or renamed)
snippets/visualbasic/VS_Snippets_WebNet/FormsAuthenticationHashPassword/VB/formsauthenticationhashpasswordvb.aspx	✅Succeeded	n/a (file deleted or renamed)
snippets/visualbasic/VS_Snippets_WebNet/System.Web.Management.SqlServices/VB/usingsqlservices.vb	✅Succeeded	n/a (file deleted or renamed)
snippets/visualbasic/VS_Snippets_WebNet/System.Web.Security.IMembershipProvider/VB/imembershipprovider.vb	✅Succeeded
snippets/visualbasic/VS_Snippets_WebNet/System.Web.Security.IMembershipProvider/VB/imembershipprovidergetallusers.vb	✅Succeeded	n/a (file deleted or renamed)
snippets/visualbasic/VS_Snippets_WebNet/System.Web.Security.IMembershipProvider/VB/Project.vbproj	✅Succeeded
snippets/visualbasic/VS_Snippets_WebNet/System.Web.UI.WebControls.ChangePassword.OnChangingPassword/VB/changepassword_vb.aspx	✅Succeeded	n/a (file deleted or renamed)
snippets/visualbasic/VS_Snippets_WebNet/System.Web.UI.WebControls.ParameterCollection_2/VB/paramcoll2vb.aspx	✅Succeeded	n/a (file deleted or renamed)
xml/System.Web.Configuration/ProcessModelSection.xml	✅Succeeded	View
xml/System.Web.Management/SessionStateType.xml	✅Succeeded	View
xml/System.Web.Management/SqlExecutionException.xml	✅Succeeded	View
xml/System.Web.Management/SqlFeatures.xml	✅Succeeded	View
xml/System.Web.Management/SqlServices.xml	✅Succeeded	View
xml/System.Web.Security/ActiveDirectoryMembershipProvider.xml	✅Succeeded	View
xml/System.Web.Security/FormsAuthentication.xml	✅Succeeded	View
xml/System.Web.Security/MembershipUser.xml	✅Succeeded	View
xml/System.Web.Security/MembershipUserCollection.xml	✅Succeeded	View

This comment lists only the first 25 files in the pull request.
For more details, please refer to the build report.

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[gewarren]

Ping @Rick-Anderson