chore: enable backoff when event ordering is disabled

[atzoum]

Description

Enabling backoff even when event ordering is disabled.
Additionally, increasing jobIteratorMaxQueries to 50 so that router can go deeper in jobsdb's queue in case a large number of events exist in the queue's head which are for the same userID and destination that is rate limited. By increasing the number of max queries we are effectively allowing the router to pickup jobs for other non-rate-limited users which are waiting at the tail of the queue.

Notion Ticket

Link

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

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (0aab933) 52.27% compared to head (882c37f) 52.28%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3121      +/-   ##
==========================================
+ Coverage   52.27%   52.28%   +0.01%     
==========================================
  Files         321      321              
  Lines       52765    52766       +1     
==========================================
+ Hits        27583    27591       +8     
+ Misses      23525    23521       -4     
+ Partials     1657     1654       -3     

Impacted Files	Coverage Δ
router/router.go	78.14% <100.00%> (+0.27%)	⬆️

... and 7 files with indirect coverage changes

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