prod-v2.15.0

What's Changed

• Remove remaining references to datastore by @stephen-soltesz in #403
• Remove v1 saver struct logic by @stephen-soltesz in #404
• Remove more obsolete v1 logic by @stephen-soltesz in #405
• Remove legacy URL and v1 job logic, update tests for v2 resources by @stephen-soltesz in #406
• Add job source bucket to output path by @stephen-soltesz in #407
• Add -input_location flag for gardener load bucket source by @stephen-soltesz in #408

Full Changelog: prod-v2.14.0...prod-v2.15.0