chore: clean up unused variables

[cisse21]

Description

Cleaning up few unused variables and functions across rudder-server

Notion Ticket

Notion 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.

[cisse21]

Removed failedEventsList from status object because we have another query from rudder-cli which displays the status of the last 5 failed jobs get-failed

[codecov]

Codecov Report

Base: 43.90% // Head: 43.85% // Decreases project coverage by -0.05% ⚠️

Coverage data is based on head (6802059) compared to base (3659e12).
Patch coverage: 35.29% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2647      +/-   ##
==========================================
- Coverage   43.90%   43.85%   -0.06%     
==========================================
  Files         187      187              
  Lines       40038    39944      -94     
==========================================
- Hits        17579    17516      -63     
+ Misses      21363    21332      -31     
  Partials     1096     1096              

Impacted Files	Coverage Δ
processor/processor.go	72.02% <ø> (-0.16%)	⬇️
router/admin.go	4.23% <0.00%> (+0.20%)	⬆️
router/failed-events-manager.go	3.44% <ø> (ø)
utils/misc/misc.go	12.85% <ø> (+0.31%)	⬆️
processor/transformer/transformer.go	64.97% <33.33%> (-0.79%)	⬇️
router/router.go	74.00% <36.66%> (-0.21%)	⬇️
enterprise/reporting/setup.go	38.09% <0.00%> (-14.29%)	⬇️
config/backend-config/namespace_config.go	70.83% <0.00%> (-3.13%)	⬇️
enterprise/reporting/reporting.go	8.33% <0.00%> (-1.44%)	⬇️

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