Move guardian suppressions to code instead of .gdnsuppress (dotnet#56911)

This allows us to remove duplication of the suppressions in the VMR.

Author: akoeplinger

.config/guardian/.gdnbaselines

@@ -3,6 +3,10 @@
 # Obviously, don't actually use this to produce production certs
 #
 
+[Diagnostics.CodeAnalysis.SuppressMessageAttribute(
+ 'PSAvoidUsingConvertToSecureStringWithPlainText',
+ '',
+ Justification='this is creating a certificate for local testing')]
 param(
     [Parameter(Mandatory = $true)]
     $OutFile

src/DataProtection/CreateTestCert.ps1

@@ -1,4 +1,8 @@
-[CmdletBinding()]
+[Diagnostics.CodeAnalysis.SuppressMessageAttribute(
+ 'PSAvoidUsingConvertToSecureStringWithPlainText',
+ '',
+ Justification='$accountPassword is a script parameter so it needs to be plain-text')]
+[CmdletBinding()]
 param(
 	[Parameter(Mandatory=$true)]
 	[string]$serverName,
@@ -64,4 +68,4 @@ if($remoteResult.Length > 0)
 {
     $finalExitCode=$remoteResult[$remoteResult.Length-1]
     exit $finalExitCode
-}
+}