CmdPal: Include Microsoft.CmdPal.Ext.PerformanceMonitor in SLNF (#45738)

## Summary of the Pull Request

This PR updates Command Palette's solution filter to include recently
added Microsoft.CmdPal.Ext.PerformanceMonitor project.

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## PR Checklist

- [ ] Closes: #xxx
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issues) -->
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

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## Detailed Description of the Pull Request / Additional comments

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src/modules/cmdpal/CommandPalette.slnf

@@ -37,6 +37,7 @@
       "src\\modules\\cmdpal\\ext\\Microsoft.CmdPal.Ext.Calc\\Microsoft.CmdPal.Ext.Calc.csproj",
       "src\\modules\\cmdpal\\ext\\Microsoft.CmdPal.Ext.ClipboardHistory\\Microsoft.CmdPal.Ext.ClipboardHistory.csproj",
       "src\\modules\\cmdpal\\ext\\Microsoft.CmdPal.Ext.Indexer\\Microsoft.CmdPal.Ext.Indexer.csproj",
+      "src\\modules\\cmdpal\\ext\\Microsoft.CmdPal.Ext.PerformanceMonitor\\Microsoft.CmdPal.Ext.PerformanceMonitor.csproj",
       "src\\modules\\cmdpal\\ext\\Microsoft.CmdPal.Ext.Registry\\Microsoft.CmdPal.Ext.Registry.csproj",
       "src\\modules\\cmdpal\\ext\\Microsoft.CmdPal.Ext.RemoteDesktop\\Microsoft.CmdPal.Ext.RemoteDesktop.csproj",
       "src\\modules\\cmdpal\\ext\\Microsoft.CmdPal.Ext.Shell\\Microsoft.CmdPal.Ext.Shell.csproj",