Updates to plot_wo

[GL-S]

This PR includes updates to the plot_wo function.

Previously, the function would assign the colour blue to pixels with the non‑contiguous flag == True.
This occurred due to the colour‑map logic, which relied on bounds and applied colours to all values indiscriminately.

The core logic of the function was not changed, but a mask is now applied beforehand to remove non‑contiguous pixels.

Also, a new Terrain Shadow class has been added to the legend, and the High Slope + Cloud class was removed (it is now included within the Cloud class).

Finally, the code has been simplified by using a single mapping dictionary that groups labels, bounds and RGB values together.

Example:
BEFORE

AFTER

Checklist

If this is a notebook, then have you:

• Checked the structure of the notebook follows our DEA-notebooks template
• Removed any unused Python packages from Load packages
• Removed any unused/empty code cells
• Removed any guidance cells (e.g. General advice)
• Ensured that all code cells follow the PEP8 standard for code. The jupyterlab_code_formatter tool can be used to format code cells to a consistent style: select each code cell, then click Edit and then one of the Apply X Formatter options (YAPF or Black are recommended).
• Included relevant tags in the final notebook cell (refer to the DEA Tags Index, and re-use tags if possible)
• Tested notebook on the DEA Sandbox
• Cleared all outputs, run notebook from start to finish, and save the notebook in the state where all cells have been sequentially evaluated
• If applicable, update the Notebook currently compatible with line below the notebook title to reflect the environments the notebook is compatible with
• Check for any spelling mistakes using the DEA Sandbox's built-in spellchecker (double click on markdown cells then right-click on pink highlighted words). For example:

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[GL-S]

the first commit binary-dea-wo-plot was accidental, it was meant to be for another repository, so it accidentally included some testing notebook cells that were later deleted