Clear file uploads

[DanielPreciado-Marquez]

Changes

Improvements:

• Added button to clear file upload inputs (File inputs can't be cleared #308)
• Load configurations in the UI already after the import instead of after the confirmation
• Added error for trying to import configurations that are not contained in the file

Closes #308

[github-actions]

	Tests	Passed ✅	Skipped	Failed	Time ⏱
Cinnamon Test - Test Report	247 ran	247 passed	0 skipped	0 failed	38s 709ms
Cinnamon Anonymization - Test Report	25 ran	25 passed	0 skipped	0 failed	20s 182ms
Cinnamon Risk-Assessment - Test Report	21 ran	21 passed	0 skipped	0 failed	45ms
Cinnamon Synthetization - Test Report	59 ran	59 passed	0 skipped	0 failed	759ms

• View Cinnamon Test - Test Report
• View Cinnamon Anonymization - Test Report
• View Cinnamon Risk-Assessment - Test Report
• View Cinnamon Synthetization - Test Report