build: make the PGO build work again; upgrade nuget (#19810)

Two main changes:

- the build was failing for ARM64 because the build agents run out of
memory downloading artifacts; this is a known issue that nobody cares to
fix (and it pertains to using the x64 emulated agent host on native
arm64 machines)
   - deleting the PDBs shrinks the build output by 2500MB :P
- we had to switch to a new type of identity for publishing nuget
packages to our cross-org feed

I've verified that we get counts _and_ can even produce final PGO count
packages for both architectures!

build/pipelines/pgo.yml

@@ -50,6 +50,7 @@ stages:
           buildEverything: true
           pgoBuildMode: Instrument
           artifactStem: -instrumentation
+          keepAllExpensiveBuildOutputs: false # the ARM64 build agent runs out of memory downloading the artifacts...
 
   - stage: RunPGO
     displayName: Run PGO

build/pipelines/templates-v2/job-pgo-build-nuget-and-publish.yml

@@ -26,6 +26,7 @@ jobs:
     pgoToolsPath: $(Build.SourcesDirectory)\build\PGO
     nuspecPath: $(pgoToolsPath)\NuSpecs
     nuspecFilename: PGO.nuspec
+    nugetFeed: "https://pkgs.dev.azure.com/shine-oss/terminal/_packaging/TerminalDependencies/nuget/v3/index.json"
 
   steps:
   - checkout: self
@@ -45,7 +46,8 @@ jobs:
 
   - task: NuGetAuthenticate@1
     inputs:
-      nuGetServiceConnections: 'Terminal Public Artifact Feed'
+      azureDevOpsServiceConnection: 'Terminal Public Artifact Feed'
+      feedUrl: $(nugetFeed)
 
   # In the Microsoft Azure DevOps tenant, NuGetCommand is ambiguous.
   # This should be `task: NuGetCommand@2`
@@ -68,15 +70,7 @@ jobs:
     artifact: pgo-nupkg-${{ parameters.buildConfiguration }}${{ parameters.artifactStem }}
     displayName: "Publish Pipeline Artifact"
 
-  - task: 333b11bd-d341-40d9-afcf-b32d5ce6f23b@2
-    displayName: 'NuGet push'
-    inputs:
-      command: push
-      nuGetFeedType: external
-      packagesToPush: $(Build.ArtifactStagingDirectory)/*.nupkg
-      # The actual URL and PAT for this feed is configured at
-      # https://microsoft.visualstudio.com/Dart/_settings/adminservices
-      # This is the name of that connection
-      publishFeedCredentials: 'Terminal Public Artifact Feed'
-      feedsToUse: config
-      nugetConfigPath: '$(Build.SourcesDirectory)/NuGet.config'
+  - pwsh: |-
+      $nupkg = Get-Item "$(Build.ArtifactStagingDirectory)/*.nupkg"
+      & nuget push -ApiKey az -Source "$(nugetFeed)" "$nupkg"
+    displayName: NuGet push

build/pipelines/templates-v2/job-run-pgo-tests.yml

@@ -45,6 +45,10 @@ jobs:
     displayName: Extract the unpackaged build for PGO
 
   - template: steps-ensure-nuget-version.yml
+    parameters:
+      ${{ if eq(parameters.buildPlatform, 'arm64') }}:
+        # The ARM64 agents do not seem to have NuGet installed
+        forceNugetInstallation: true
 
   - powershell: |-
       $Package = 'Microsoft.Internal.Windows.Terminal.TestContent'

build/pipelines/templates-v2/steps-ensure-nuget-version.yml

@@ -1,5 +1,10 @@
+parameters:
+  - name: forceNugetInstallation
+    type: boolean
+    default: false
+
 steps:
-- ${{ if eq(variables['System.CollectionId'], 'cb55739e-4afe-46a3-970f-1b49d8ee7564') }}:
+- ${{ if and(ne(parameters.forceNugetInstallation, true), eq(variables['System.CollectionId'], 'cb55739e-4afe-46a3-970f-1b49d8ee7564')) }}:
   - pwsh: |-
       Write-Host "Assuming NuGet is already installed..."
       & nuget.exe help
@@ -7,6 +12,6 @@ steps:
 
 - ${{ else }}:
   - task: NuGetToolInstaller@1
-    displayName: Use NuGet 6.6.1
+    displayName: Use NuGet 7.0.1
     inputs:
-      versionSpec: 6.6.1
+      versionSpec: 7.0.1