chore(jobsdb): increase maintenance operation timeouts and make them hot-reloadable

[atzoum]

Description

In scenarios where the database is being throttled, database query delays can cause jobsdb's maintenance operations to take much longer.
Usually, a maintenance operation times out when it doesn't manage to acquire a write lock in time. But this operation will keep retrying periodically and will be timing out continuously, causing the system to come to a standstill (a waiting write lock causes any other read lock requests to block too).
Therefore increasing timeouts to more sensible values (10m) and making them hot-reloadable as well

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 no project coverage change.

Comparison is base (4171517) 68.16% compared to head (120591d) 68.17%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3601   +/-   ##
=======================================
  Coverage   68.16%   68.17%           
=======================================
  Files         319      319           
  Lines       50445    50445           
=======================================
+ Hits        34387    34390    +3     
+ Misses      13841    13834    -7     
- Partials     2217     2221    +4     

Impacted Files	Coverage Δ
jobsdb/jobsdb.go	72.63% <100.00%> (+0.12%)	⬆️

... and 8 files with indirect coverage changes

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