EQS-509 Get validator_version from CIR

[Paul-Joel]

Motivation and Context

Code modifies the existing 'instrument' proxy endpoint to retrieve the validator_version from CIR via the v3/ci_metadata endpoint

What has changed

Where the instrument endpoint previously took the validator_version from the CIR retrieve_collection_instrument endpoint return, it now makes an additional call to the CIR /v3/ci_metadata endpoint to get the instruments metadata, and then uses the contained validator_version value.

How to test?

1. Set the port number part of CIR_API_BASE_URL in your local .env file to 3030
2. Locally start Proxy and Converter
3. Pull and run the latest version of eq_cir_fastapi via Docker, following the instructions in the FastAPI repo
4. Using the /docs url, load a questionnaire schema via the /v2/publish_collection_instrument endpoint
5. From the 200 return metadata, copy the guid value.
6. Using the url http://localhost:5050/instrument/guid?version=10.0.0, run proxy and confirm a successful return, replacing the guid with the one copied in step 5

Note this can also be run locally with eq-runner-mock-cir once the new endpoint is merged, by skipping step 1

Links

https://github.com/ONSdigital/eq-cir-fastapi
https://officefornationalstatistics.atlassian.net/browse/EQS-509