2057 Allow Resetting GUI to Default Layout

[RasmiaKulan]

Issue Closes #2057

Description

• Updated main/view.py by:
  1. Adding a reset_layout function that handles closing and reopening all stacks, while also catching errors if the action is unsuccessful.
  2. Creating a View menu and an option for resetting the layout.
• Updated stack_visualiser/view.py by adding a Reset main window layout action to the right-click menu.
• Added unit tests for reset_layout, covering:
  1. No stacks available (shows error dialog).
  2. Recreating stacks (closes old ones, clears state, and rebuilds).
  3. Exception handling (shows error dialog with details).

Developer Testing

• I have verified unit tests pass locally: python -m pytest -vs
• I have verified that the unit tests I added pass locally: python -m unittest -v mantidimaging.gui.windows.test.view_test

Acceptance Criteria and Reviewer Testing

• Unit tests pass locally: python -m pytest -vs
• Load one or two datasets.
• Drag some stacks next to each other within the main window, and drag others outside the main window.
• From the top menu, click View → Reset default layout and confirm the layout resets to the default.
• Right-click on a stack, select Reset main window layout, and confirm the layout resets to the default.

Expected Behaviour

reset_layout_to_default.mp4

Documentation and Additional Notes

• Screenshot tests have been updated
  • Before merge for developer: Resolve the change on applitools by, creating a new baseline for test and verify that the tests pass.
  • After merge for reviewer: Go to Applitools compare and merge page, select all changes and merge dev branch to default branch
  • After merge for reviewer: Verify that other PR's screenshot tests do not start to fail (See Applitools baselines for more info) -->

[coveralls]

coverage: 70.339% (-0.3%) from 70.656%
when pulling ef90380 on 2057-reset_gui_to_default_layout
into f1e1e8b on main.

[hussam-stfc]

The description is a bit ambiguous, perhaps we could mention resetting floating windows

[hussam-stfc]

Has this file ended up in this PR by accident?

[RasmiaKulan]

@hussam-stfc I forgot to add the release notes for that issue when I closed it, so I snuck them in here. 👀