Migrate job to abstract schema
Postgres:
- Drop deafault from job_id
- Add default to job_cmd
- Change job_namespace datatype to INTEGER
- Drop job_cmd_namespace_title index
- Add job_cmd index on the same fields as MySQL
- Rename index job_timestamp_idx
MySQL:
- Change job_title datatype to VARBINARY
- Change job_timestamp datatype to BINARY (mwtimestamp)
- Change job_token_timestamp datatype to BINARY (mwtimestamp)
Bug: T230428
Bug: T164898
Bug: T42626
Change-Id: I207aefc48c7bcbb5b5362af4b63d9a1383019a6d