Fix missing task names from job status

[varundey]

Fixes the null values in log as discussed in https://github.com/hasura/hasura-cloud-preview-apps/issues/57

parse-migration and 'parse-metadata' steps were not handled on the action handler and hence whenever backend was running these steps, the workflow would query and print these steps as defaultnull`. This PR fixes that by handling the events

Before:

After (please ignore the extra logging info) parse-metadata:

parse-migration: