Describe the bug

Instrument class validate() method should validate data against the instrument definition, but ends up only doing the same as determineDataEntryAllowed() method (alias).

This is confusing in the code, as this is making the API instrument endpoints checks not validating data even if the code seems pretty explicit about it. The process is:

1. check if data entry is allowed = instrument not in complete state.
2. get the data from the request payload.
3. check if the data is valid for that instrument.

Step 3. should data validated against the instrument, but ends up only doing the same as step 1.

This makes that the instrument API endpoint is accepting any data.

To Reproduce
Steps to reproduce the behavior (attach screenshots if applicable):

1. Get an instrument with different types of fields (get the commentID/candidate/visit label/instrument).
2. Go to api_docs: Tools > API documentation.
3. Get the instrument data with the GET endpoint /candidates/{candid}/{visit}/instruments/{instrument}.
4. Copy paste it to the PUT endpoint /candidates/{candid}/{visit}/instruments/{instrument}.
5. Change some values, also changing select/multiselect (dropdown) to options that do not even exist in the option list of these fields.
6. send the request, see the 200 ok code.
7. Check the corresponding data from the db.

What did you expect to happen?
An error code returned if the validation of data fails.