Fixed origins api for maven components throwing 500 error when invalid group id is provided

[yashkohli88]

Below are the tasks completed as a part of this fix -

• Code updated to check if the value exist and test case added to verify the changes.
• New Test cases added for happy paths and all the error scenarios.
• Fixtures added for the input and one of the response.
• getResponse function reads the fixture having response from maven repo for each query (group id or artefact id) converts it to json object and then it is passed to getSuggestions function from originMaven.js file.

List of testcases added in the origins.js file related to the changes -

• Return suggestions when incomplete group id is provided as input
• Return list of artefacts when complete group id is provided as input
• Return blank response when group id is invalid and suggestions are not present
• Return blank response when group id and artefact id are invalid and suggestions are not present

This fix is related to Issue 1167

[elrayle]

LGTM! Thanks for getting in all the thorough testing.