Issue 5287- Endpoints to get the md5 hash of the original model file

[Bogdan-Crn]

This fixes #5287

Description

• Created endpoint for containers to allow retrieval of the MD5 data for the container
• Created endpoint for federations to allow retrieval of the MD5 data for all the containers in the federation that the user has access to
• Created a new function in FileRefs to update a specific .ref file, this is to allow the caching of MD5 hashes for future reference

Test cases

• Unit tests for containers getting the MD5 data, first time the database should not have the MD5Hash property and the second time the system should have set it in the db
• Unit tests for federation getting the MD5 data, similar to above
• Unit test for the FileRefs new function
• E2E tests for containers and federations testing scenarios where the user has different levels of rights

[Bogdan-Crn]

• Moved most of the modelList logic to the filesManager.
• Updated the federation check to see if the user has access to the container.
• Updated what happens if the federation is empty.
• Updated the tests to contain generateRandomString() where necessary.

[carmenfan]

Looking good, just a few minor comments 😆