Adding MR deprecation changes

[gautamshanu]

Dear DIL maintainers,

Please accept this PR. I understand that it will not be reviewed until I have checked off all the steps below!

JIRA

• My PR addresses the following JIRA issues and references them in the PR title.

Description

• Here are some details about my PR, including screenshots (if applicable):

This PR basically adds the changes needed for the support of the new Gobblin version. This is required for the successful deprecation of MapReduce jobs which Gobblin internally made use of in the previous versions.

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:
  This has been tested as part of the end-to-end flow executions.

Commits

• My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"