Don't compress job arguments twice

What does this MR do?

When a job is scheduled in the future, it runs through the client middleware twice. Once on scheduling, once when queueing.

Since the args key of the job would already be compressed at this time, we don't need to compress it some more. Doing so would cause the decompression to fail on the serverside.

For gitlab-com/gl-infra/scalability#1176 (closed)

Does this MR meet the acceptance criteria?

Conformity

• I have included changelog trailers, or none are needed. (Does this MR need a changelog?): Not needed, this change is still feature flagged
• I have added/updated documentation, or it's not needed. (Is documentation required?): Documentation will come as part of gitlab-com/gl-infra/scalability#1109 (closed)
• I have properly separated EE content from FOSS, or this MR is FOSS only. (Where should EE code go?)
• I have added information for database reviewers in the MR description, or it's not needed. (Does this MR have database related changes?)
• I have self-reviewed this MR per code review guidelines.
• This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)
• I have followed the style guides.
• This change is backwards compatible across updates, or this does not apply.

Availability and Testing

• I have added/updated tests following the Testing Guide, or it's not needed. (Consider all test levels. See the Test Planning Process.)
• I have tested this MR in all supported browsers, or it's not needed.
• I have informed the Infrastructure department of a default or new setting change per definition of done, or it's not needed.