✨ Change label selector from searchable dropdown to clickable buttons

[foysalit]

• Change the label form to use clickable buttons instead of searchable dropdown. The searchable dropdown package has been removed as dependency. Labels can still be searched and custom labels can be added.
• Add cypress tests around the label add/remove and search behavior.
• Refactor cypress test code to make them more shareable.

Selectable label buttons

Search labels and add custom label

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