Remove pipeline test config json

[ycombinator]

What does this PR do?

This PR removes the deprecated JSON-formatted pipeline test configuration files.

Why is it important?

In #139, we deprecated JSON-formatted pipeline test configuration files. Stakeholders were immediately notified of that change, including the notification that the deprecated files would be removed in a couple of weeks. We're at that point in time now.

Checklist

• I have added test packages to test/packages that prove my change is effective.
• I have added an entry in versions/N/changelog.yml.

Related issues

• Continuation of Should pipeline test config be in YAML? #106

[ycombinator]

I expect CI to fail on this PR as it stands at the moment because I have deliberately not yet removed the test-*-config.json files from under test/packages/**/_dev/test/pipeline/. This will serve as a test for the spec changes in this PR.

Once this CI failure is confirmed, I will remove the test-*-config.json files from under test/packages/**/_dev/test/pipeline/, which should cause CI to go green again.

[elasticmachine]

💚 Build Succeeded

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Build stats

• Build Cause: Pull request #150 updated

• Start Time: 2021-03-16T18:02:23.986+0000

• Duration: 2 min 20 sec

• Commit: 46f059a

Trends 🧪

[ycombinator]

CI failed as expected 👍:

[2021-03-16T17:52:57.944Z] === RUN   TestValidateFile/good

[2021-03-16T17:52:57.944Z]     validator_test.go:58: 

[2021-03-16T17:52:57.944Z]         	Error Trace:	validator_test.go:58

[2021-03-16T17:52:57.944Z]         	Error:      	Received unexpected error:

[2021-03-16T17:52:57.944Z]         	            	found 1 validation error:

[2021-03-16T17:52:57.944Z]         	            	   1. item [test-access-event.json-config.json] is not allowed in folder [../../../../test/packages/good/data_stream/foo/_dev/test/pipeline]

[2021-03-16T17:52:57.944Z]         	Test:       	TestValidateFile/good

[2021-03-16T17:52:57.944Z] === RUN   TestValidateFile/missing_data_stream

[2021-03-16T17:52:57.944Z] --- FAIL: TestValidateFile (0.09s)

Proceeding with removing the offending file now...