[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/Programs/UWPApplication.cs

@@ -95,7 +95,7 @@ public class UWPApplication : IUWPApplication
 
         commands.Add(
             new CommandContextItem(
-                new Commands.CopyPathCommand(Location))
+                new CopyTextCommand(Location) { Name = Resources.copy_path })
             {
                 RequestedShortcut = KeyChordHelpers.FromModifiers(ctrl: true, shift: true, vkey: VirtualKey.C),
             });

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.Apps/Programs/Win32Program.cs

@@ -202,7 +202,7 @@ public class Win32Program : IProgram
         }
 
         commands.Add(new CommandContextItem(
-                    new Commands.CopyPathCommand(FullPath))
+                    new CopyTextCommand(FullPath) { Name = Resources.copy_path })
         {
             RequestedShortcut = KeyChordHelpers.FromModifiers(ctrl: true, shift: true, vkey: VirtualKey.C),
         });