HARMONY-1938: Remove fallback authentication functionality and related code

[chris-durbin]

Jira Issue ID

HARMONY-1938

Description

In order to support local Harmony development without requiring an Earthdata Login application we needed to make some changes to no longer require OAUTH* environment variables with the EDL app information. As part of that change we're also removing the FALLBACK_AUTHN_ENABLED functionality that has not been used for the past few years which required an EDL client application in order to authenticate using a username and password.

Local Test Steps

Test along with the harmony-1938 branch in the main harmony repo. Make sure that services start correctly when OAUTH* environment variables are not set, and the services can continue to successfully download data.

I used this branch for building the opera-rtc-s1-browse image - https://github.com/chris-durbin/opera-rtc-s1-browse/tree/use-local-harmony-service-lib

1. Clone the above repo and checkout the use-local-harmony-service-lib branch.
2. Make sure you are on this harmony-1938 branch in the harmony-service-lib-py repo.
3. run build-service
4. Set the variables in your harmony .env:

OPERA_RTC_S1_BROWSE_IMAGE=asf/opera-rtc-reproject:latest
OPERA_RTC_S1_BROWSE_SERVICE_QUEUE_URLS='["asf/opera-rtc-reproject:latest,http://sqs.us-west-2.localhost.localstack.cloud:4566/000000000000/opera-rtc-s1-browse.fifo"]'

5. Include opera-rtc-s1-browse in your LOCALLY_DEPLOYED_SERVICES.
6. bin/restart-services

You can then submit a request: http://localhost:3000/C1259974840-ASF/ogc-api-coverages/1.0.0/collections/all/coverage/rangeset?granuleId=G1260014889-ASF&format=image%2Fpng&skipPreview=true

It will fail when it gets to HyBIG (unless you also update it to use the local service library changes), but you can verify that the service produced the correct outputs by looking at your local s3 artifacts bucket.

PR Acceptance Checklist

• Acceptance criteria met
• Tests added/updated (if needed) and passing
• Documentation updated (if needed)

[ygliuvt]

Tested successfully with locally built harmony-service-examples and harmony-1938 branch of the harmony project.