Remove all macOS-10.15 related code (#7078)

images/macos/tests/Android.Tests.ps1

@@ -75,8 +75,4 @@ Describe "Android" {
             Validate-AndroidPackage $PackageName
         }
     }
-
-    It "HAXM is installed" -Skip:($os.IsHigherThanCatalina) {
-        "kextstat | grep 'com.intel.kext.intelhaxm'" | Should -ReturnZeroExitCode
-    }
 }

images/macos/tests/Common.Tests.ps1

@@ -139,7 +139,7 @@ Describe "VirtualBox" -Skip:($os.IsBigSur) {
     }
 }
 
-Describe "CodeQLBundles" -Skip:($os.IsCatalina) {
+Describe "CodeQLBundles" {
     It "Latest CodeQL Bundle" {
         $CodeQLVersionWildcards = Join-Path $Env:AGENT_TOOLSDIRECTORY -ChildPath "CodeQL" | Join-Path -ChildPath "*"
         $LatestCodeQLVersionPath = Get-ChildItem $CodeQLVersionWildcards | Sort-Object -Property { [SemVer]$_.name } -Descending | Select-Object -First 1 -Expand FullName
@@ -175,7 +175,7 @@ Describe "CodeQLBundles" -Skip:($os.IsCatalina) {
     }
 }
 
-Describe "Colima" -Skip:($os.IsCatalina) {
+Describe "Colima" {
     It "Colima" {
         "colima version" | Should -ReturnZeroExitCode
     }

images/macos/tests/System.Tests.ps1

@@ -32,11 +32,7 @@ Describe "Audio device" {
         "SwitchAudioSource -c" | Should -ReturnZeroExitCode
     }
 
-    It "Audio channel Soundflower (2ch)" -Skip:($os.IsHigherThanCatalina) {
-        SwitchAudioSource -c | Should -BeLikeExactly "Soundflower (2ch)"
-    }
-
-    It "Audio channel BlackHole 2ch" -Skip:($os.IsCatalina) {
+    It "Audio channel BlackHole 2ch" {
         SwitchAudioSource -c | Should -BeLikeExactly "BlackHole 2ch"
     }
 }