HARMONY-1958: Allow service chains to skip validating variables exist in the CMR

[chris-durbin]

Jira Issue ID

HARMONY-1958

Description

Allows service chains to skip validating variables exist in the CMR. This was requested by the Giovanni team to support their future time and area averaging services.

Local Test Steps

Since no service chains are currently configured to skip validation you will need to manually modify one of the service chains.

First test without changing services.yml to make sure you get a validation error with something like:
http://localhost:3000/C1233800302-EEDTEST/ogc-api-coverages/1.0.0/collections/bad_var/coverage/rangeset?subset=lat(20%3A60)&subset=lon(-140%3A-50)&granuleId=G1233800343-EEDTEST&outputCrs=EPSG%3A31975&format=image%2Fpng&subset=time(%222002-09-15T00%3A00%3A00.000Z%22%3A%222022-09-25T00%3A00%3A00Z%22)

{
	"code": "harmony.RequestValidationError",
	"description": "Error: Coverages were not found for the provided variables: bad_var"
}

Then modify the harmony-service-example chain for UAT and add validate_variables: false to the service chain definition. Repeat the request. This time the request should be accepted and you should see it in the workflow-ui. It will fail because the service will not be able to find bad_var, but does confirm that the validation is being skipped.

PR Acceptance Checklist

• Acceptance criteria met
• Tests added/updated (if needed) and passing
• Documentation updated (if needed)
• Harmony in a Box tested? (if changes made to microservices)

[ygliuvt]

Tested successfully locally.

[indiejames]

Tested locally

[indiejames]

nit: I don't think this function ever returns null

[chris-durbin]

I went to change it, but if the value is null/undefined/empty it will not return a value, which I think means it returns null. It's the same signature as a similar function used elsewhere for parsing an EDR bbox.