e2e: Switch rig install to winget (#12762)

Using Chocolately to install rig has been flakey lately, so switching to
winget in hopes it will be more reliable.

### QA Notes
@:win
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Author: jonvanausdeln

.github/workflows/test-e2e-windows-run.yml

@@ -298,8 +298,9 @@ jobs:
 
       # Install rig (R Installation Manager)
       - name: Install rig
+        shell: pwsh
         run: |
-          choco install rig
+          winget install --id Posit.rig --accept-source-agreements --accept-package-agreements
 
       # Install R 4.4.0 using rig
       - name: Install R 4.4.0