[CmdPal] Eliminate CopyTextCommand duplicates (#41347)

## Summary of the Pull Request
Removes redundant CopyCommands and replaces their usage with
`CopyTextCommand` from the toolkit. This is actually recommend by the
[docs](https://learn.microsoft.com/en-us/windows/powertoys/command-palette/command-results#showtoast-command-result),
we should probably lead by example 😄
> Consider the CopyTextCommand in the helpers - this command will show a
toast with the text "Copied to clipboard", then dismiss the palette.

Only functionality change is that they now display *Copied to
clipboard!* after copying.
## PR Checklist

- [x] Closes: #41346
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [x] **Tests:** All pass
- [x] **Localization:** All end-user-facing strings can be localized
- [x] **Dev docs:** No need
- [x] **New binaries:** None
- [x] **Documentation updated:** No need
## Detailed Description of the Pull Request / Additional comments
Custom command names (e.g. *Copy path* instead of *Copy*) are preserved.
Strings put out of use have been deleted.
CopyCommands from the Registry and Clipboard plugins are left untouched,
as they contain special logic.
The error handling in `CopyPathCommand` from Apps was unnecessary, since
it's already taken care of by `ClipboardHelper`.
## Validation Steps Performed
Manual testing

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.Apps/Properties/Resources.Designer.cs

@@ -78,24 +78,6 @@ namespace Microsoft.CmdPal.Ext.Apps.Properties {
             }
         }
         
-        /// <summary>
-        ///   Looks up a localized string similar to Copied to clipboard!.
-        /// </summary>
-        internal static string copied_to_clipboard {
-            get {
-                return ResourceManager.GetString("copied_to_clipboard", resourceCulture);
-            }
-        }
-        
-        /// <summary>
-        ///   Looks up a localized string similar to Copy failed ({0}). Please try again..
-        /// </summary>
-        internal static string copy_failed {
-            get {
-                return ResourceManager.GetString("copy_failed", resourceCulture);
-            }
-        }
-        
         /// <summary>
         ///   Looks up a localized string similar to Copy path.
         /// </summary>