remove "v1" multipart upload code
"v2" of multipart upload was introduced in an additive sense, allowing gradual migration to the new version. Now that the migration is done we need to remove the original version to avoid having duplicate code. Removal involves a final migration step in which internal usage (e.g. uploads of wikis and zipped file bundles by workers) is migrated to the "v2" code.
The only usages of POST /createchunkedfileuploadtoken are from the COMMAND_LINE client as recent as 2 months ago (April 20, 2019).
We should start users who are still using clients that are many years outdated to update.
While working on PLFM-5086, I encountered the deprecated code again. Ran the following query to determine if the "v1" services were still in uses:
These results indicate that the 'v1' services are still in use