[REFACTOR] HLD pipeline command

[dennisseah]

Related to microsoft/bedrock#885

1. move command declaration to a JSON file
2. standardized on the function in command ts file
3. use the CommandBuilder's exit function
4. still default value of command option values is set to "" and values fall back to values in config file, typeof optionValue === "string" is not needed.
5. added more tests

[andrebriggs]

Thanks @dennisseah. This looks in line with the other refactoring. Does the integration test pass with these changes?

[dennisseah]

Thanks @dennisseah. This looks in line with the other refactoring. Does the integration test pass with these changes?

Yes, I will run it again as i just did a rebase.

[dennisseah]

Thanks @dennisseah. This looks in line with the other refactoring. Does the integration test pass with these changes?

Yes, I will run it again as i just did a rebase.

it is good

Successfully reached the end of the validations scripts.

[andrebriggs]

Approved pending any integration test re-runs from further commits @dennisseah

[dennisseah]

ran sh validations.sh successful. Merging this PR. Thanks