[release/v7.4] Suppress false positive PSScriptAnalyzer warnings in tests and build scripts (#26058)

test/powershell/engine/Api/Serialization.Tests.ps1

@@ -1,5 +1,9 @@
 # Copyright (c) Microsoft Corporation.
 # Licensed under the MIT License.
+
+[System.Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidUsingConvertToSecureStringWithPlainText', '')]
+param()
+
 Describe "Serialization Tests" -tags "CI" {
     BeforeAll {
         $testfileName="SerializationTest.txt"
@@ -99,4 +103,3 @@ Describe "Serialization Tests" -tags "CI" {
         SerializeAndDeserialize($versionObject).TestScriptProperty | Should -Be $versionObject.TestScriptProperty
     }
 }
-

test/powershell/engine/Remoting/PSSession.Tests.ps1

@@ -5,6 +5,9 @@
 # PSSession tests for non-Windows platforms
 #
 
+[System.Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidUsingConvertToSecureStringWithPlainText', '')]
+param()
+
 function GetRandomString()
 {
     return [System.IO.Path]::GetFileNameWithoutExtension([System.IO.Path]::GetRandomFileName())

test/powershell/engine/Remoting/RemoteSession.Basic.Tests.ps1

@@ -1,6 +1,9 @@
 # Copyright (c) Microsoft Corporation.
 # Licensed under the MIT License.
 
+[System.Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidUsingConvertToSecureStringWithPlainText', '')]
+param()
+
 Import-Module HelpersCommon
 
 function GetRandomString()