change: remove white space context menu

[AlexAndBear]

Description

This PR removes the white-space context menu, as it doesn't add any functionality but brings in inconsistency, as we don't have it on any other views (e.G., Spaces, Admin Settings, and so on). With our centralized FAB it's also quite redundant.

Related Issue

• Fixes <issue_link>

How Has This Been Tested?

• test environment:
• test case 1:
• test case 2:
• ...

Types of changes

• Bugfix
• Enhancement (a change that doesn't break existing code or deployments)
• Breaking change (a modification that affects current functionality)
• Technical debt (addressing code that needs refactoring or improvements)
• Tests (adding or improving tests)
• Documentation (updates or additions to documentation)
• Maintenance (like dependency updates or tooling adjustments)

[kulmann]

@tbsbdr opinion please. I'm kind of fond of the whitespace context menu, but it's true that the "New" actions are missing, and if we remove Create New Folder from it, there is only 'Details' left, which is not convincing...