[ENH] Test Coverage Pairwise Distance

[kavya-r30]

Describe the feature or idea you want to propose

Missing Test Coverage for Pairwise Distance Matrix in distance of visualization

Describe your proposed solution

Adding test for Pairwise Plot

Describe alternatives you've considered, if relevant

No response

Additional context

No response

[kavya-r30]

@aeon-actions-bot assign @kavya-r30