refactor: minor scheduler cleanup

[achettyiitr]

Description

• Avoid using globals (scheduledTimesCache, StartUploadAlways)

Linear Ticket

• Resolves PIPE-458

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (554a04a) 71.49% compared to head (75cc9f2) 71.41%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4032      +/-   ##
==========================================
- Coverage   71.49%   71.41%   -0.08%     
==========================================
  Files         370      370              
  Lines       54614    54634      +20     
==========================================
- Hits        39046    39018      -28     
- Misses      13246    13293      +47     
- Partials     2322     2323       +1     

Files	Coverage Δ
controlplane/controlplane.go	63.41% <100.00%> (ø)
controlplane/manager.go	66.66% <ø> (ø)
enterprise/reporting/reporting.go	44.42% <ø> (ø)
gateway/webhook/webhook.go	60.12% <ø> (ø)
jobsdb/internal/cache/cache.go	98.50% <ø> (ø)
jobsdb/jobsdb.go	73.17% <ø> (-0.29%)	⬇️
processor/eventfilter/eventfilter.go	92.07% <ø> (ø)
processor/processor.go	88.52% <ø> (ø)
router/batchrouter/handle.go	62.25% <ø> (ø)
router/batchrouter/handle_async.go	8.62% <ø> (ø)
... and 27 more

... and 9 files with indirect coverage changes

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