Test: Native file Open and Save dialogs on Linux

[deepak1556]

Refs: #146422

• Linux @bpasero
• Linux @aeschli

Complexity: 3

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This iteration we switched the native file dialog implementation in Electron to use the same component as what Chromium uses for its file dialogs. It helped address a long standing bug of open and save file dialogs appearing behind the application. Although there are no user facing API changes in the new implementation we would like to sanity test some basic bits.

File:

1. Select File > Open File and cancel the dialog
2. Select File > Open File and ensure dialog appears in front of the window
3. Open a file from step 2)
4. Edit the file and choose File > Save As, ensure the file can be saved

Folder:

1. Select File > Open Folder and cancel the dialog
2. Select File > Open Folder and ensure dialog appears in front of the window
3. In the folder open dialog ensure only folders are allowed to be open and files are inactive

Filters:

1. Select File > Open Workspace from File
2. Ensure only files with .code-workspace extension can be opened
3. Confirm opening a workspace

Filters:

1. Run Chat: Import Chat...
2. Confirm file dialog only shows .json files