Workfiles tool: disable file extension combobox in "Copy & Open"

[tadeas-hejnic]

Changelog Description

This PR disables file extension change during Copy & Open action in work files tool.

It is done via adding new argument enable_ext_selection and disabling the combobox based on this passed argument value.

Additional info

N/A

Testing notes:

1. Open the workfiles tool in DCC
2. Click on Copy & Open button

[Copilot]

Pull request overview

This PR updates the Workfiles tool UI so that when using the “Copy & Open” flow, the user can no longer change the target file extension in the Save As dialog—preventing mismatches between the selected published representation and the destination extension.

Changes:

• Added an enable_ext_selection flag to SaveAsDialog to disable the extension combobox when needed.
• Threaded an enable_ext_selection option through FilesWidget._exec_save_as_dialog(...).
• Wired the “Copy & Open” button to open the dialog with extension selection disabled.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
client/ayon_core/tools/workfiles/widgets/save_as_dialog.py	Adds an option to disable the extension combobox in the Save As dialog.
client/ayon_core/tools/workfiles/widgets/files_widget.py	Passes the new flag through dialog creation and disables extension selection for “Copy & Open”.

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