Remove special PR-based drone actions from CI

[SwikritiT]

Description

• remove the use of drone_token
• adjust the use of the cache_s3 tokens to use the names now available

Related Issue

• Part of issue: https://github.com/owncloud/QA/issues/818

Note: This PR was made by an automated script, in case something is not right I'll take care of it manually.

[phil-davis]

https://drone.owncloud.com/owncloud/calendar/1665 .drone.star:1224:37: got ':', want ']'