List activities from API

[enriquezrene]

After selecting a project all the details to register a time-entry are displayed as the following image shows:

Activities are saved in the API and we should list all of them in here using a drop-down component.

Acceptance Criteria

• Implement the required logic to get the activities from the API and list them here
• Replace the input text by a drop-down component
• All the code needs to have at least 80% code coverage