BUG: `unknown connector for` error when calling driver main function from unit test

[csun-cpointe]

Description

When calling the pipeline driver main function from pipeline unit test to simulates a full pipeline run, an error occurs saying unknown connector for request-channel

Steps to Reproduce

Clear, specific, and detailed steps taken to enable reproduction of the bug for investigation.

1. Create a pipeline with following pipeline model

{
	"name": "SimplePipeline",
	"package": "org.test",
	"type": {
		"name": "data-flow",
		"implementation": "data-delivery-spark"
	},
	"steps": [
		{
			"name": "Ingest",
			"type": "synchronous",
			"alerting": {
				"enabled": false
			},
			"dataProfiling": {
				"enabled": false
			},
			"provenance": {
				"enabled": false
			}
		}
          ]
}

2. Repeatedly build the pipeline: mvn clean install until all the manual actions are finished.
3. In the PipelineSteps.java class, an_action_occurs() function, add below content

        // execute your action
        String[] args = {};
        SimplePipelineDriver.main(args);

4. Build the spark pipeline module: mvn clean install -pl :simple-pipeline -Dmaven.build.cache.skipCache

Expected Behavior

A clear and concise description of the outcome you expected from the actions taken.
5. The build should pass without any error

Actual Behavior

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5. Build failed with below error:

[ERROR] Errors: 
[ERROR]   SRMSG00072: Unknown connector for `request-channel`.
[INFO] 
[ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0

6. If removing all in-memory kafka topics listed in the SparkTestHarness class configureMessagingChannels() function, the Failed to construct kafak producer error will occur.

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