Temporary workaround to fix filter dialog combobox

[JamesNK]

Description

Fixes #8343

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No
• Does the change require an update in our Aspire docs?
  • Yes
    • Is this introducing a breaking change?
      • Yes
        • Link to aspire-docs issue (please use this breaking-change template):
      • No
        • Link to aspire-docs issue (please use this doc-idea template):
  • No

[Copilot]

Pull Request Overview

This PR introduces a temporary workaround to fix an issue with the filter dialog combobox by replacing the usage of FluentCombobox with a new component called FixedFluentCombobox. The key changes are:

• Updated FilterDialog.razor to use FixedFluentCombobox instead of FluentCombobox.
• Added FixedFluentCombobox.razor.cs implementing a temporary override of ChangeHandlerAsync.
• Added FixedFluentCombobox.razor that simply delegates to the base component’s render tree.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/Aspire.Dashboard/Components/Dialogs/FilterDialog.razor	Replaced FluentCombobox with FixedFluentCombobox as a temporary fix.
src/Aspire.Dashboard/Components/Controls/FixedFluentCombobox.razor.cs	Added a new temporary component that overrides ChangeHandlerAsync using a nested async delegate.
src/Aspire.Dashboard/Components/Controls/FixedFluentCombobox.razor	Created a simple razor wrapper for the FixedFluentCombobox component.

[adamint]

This is fine, but can you add a link in-code to the fluentui issue as well?