Remove unneccessary dashboard dependencies

[tomjholland]

This pull request includes several changes to the pyprobe package, focusing on simplifying the codebase, removing dependencies, and updating the testing framework. The most important changes include modifying the info dictionary type, removing the distinctipy and ordered-set dependencies, and updating the dashboard.py and plot.py files to reflect these changes.

Codebase simplification:

• pyprobe/cell.py: Modified the info dictionary type to use dict[str, Optional[Any]] and removed the field_validator for setting default values for Name and color. [1] [2]
• pyprobe/plot.py: Removed the default color assignment logic in the add_line method.
• pyprobe/result.py: Updated the info dictionary type to use dict[str, Optional[Any]]. [1] [2]

Dependency removal:

• pyproject.toml: Removed the distinctipy and ordered-set dependencies.
• pyprobe/cell.py: Removed the import of distinctipy.
• pyprobe/dashboard.py: Removed the use of OrderedSet and updated the code to use a list instead. [1] [2]

Feature updates:

• pyprobe/dashboard.py: Added a new select box for choosing a cell identifier as the legend label in the plot.
• pyprobe/dashboard.py: Updated the plotting logic to include the selected cell identifier as the label.

Testing updates:

• tests/test_cell.py: Updated tests to reflect the removal of the color field and the default Name assignment logic.
• tests/test_plot.py: Updated tests to use fixed color and label values instead of relying on the info dictionary. [1] [2] [3] [4] [5]

Documentation updates:

• docs/source/user_guide/importing_data.rst: Updated the description of the info dictionary to reflect the removal of the required Name field.