CI - Fail properly if psql failed to install (#4399)

# Description of Changes

We had an issue where the install failed but did not fail the step:
```
Run choco install psql -y --no-progress
Chocolatey v2.6.0
Installing the following packages:
psql
By installing, you accept licenses for the packages.
Failed to fetch results from V2 feed at 'https://community.chocolatey.org/api/v2/Packages(Id='psql',Version='16.2.0')' with following message : Response status code does not indicate success: 504 (Gateway Time-out).
Need to add specific handling for exception type NuGetResolverInputException
Unable to find package 'psql'. Existing packages must be restored before performing an install or update.
```

# API and ABI breaking changes

<!-- If this is an API or ABI breaking change, please apply the
corresponding GitHub label. -->

None - this is just CI

# Expected complexity level and risk

None - this is just CI

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# Testing

<!-- Describe any testing you've done, and any testing you'd like your
reviewers to do,
so that you're confident that all the changes work as expected! -->

- [x] Windows smoketests are able to use `psql` properly

---------

Signed-off-by: John Detter <4099508+jdetter@users.noreply.github.com>
Signed-off-by: Zeke Foppa <196249+bfops@users.noreply.github.com>
Co-authored-by: Zeke Foppa <196249+bfops@users.noreply.github.com>

Author: jdetter

.github/workflows/ci.yml

@@ -101,8 +101,15 @@ jobs:
 
       - name: Install psql (Windows)
         if: runner.os == 'Windows'
-        run: choco install psql -y --no-progress
-        shell: powershell
+        shell: pwsh
+        run: |
+          # Fail properly if any individual command fails
+          $ErrorActionPreference = 'Stop'
+          $PSNativeCommandUseErrorActionPreference = $true
+          choco install psql -y --no-progress
+          # Check for existence, since `choco` doesn't seem to fail the step if it fails to install..
+          # See https://github.com/clockworklabs/SpacetimeDB/pull/4399 for more background.
+          Get-Command psql
 
       - name: Update dotnet workloads
         if: runner.os == 'Windows'