chore: cleanup unused code

[cisse21]

Description

Cleaning up unused code left over from deleting Migrator code

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.

[codecov]

Codecov Report

Base: 43.86% // Head: 43.81% // Decreases project coverage by -0.05% ⚠️

Coverage data is based on head (8a691d2) compared to base (8cba05e).
Patch coverage: 66.66% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2561      +/-   ##
==========================================
- Coverage   43.86%   43.81%   -0.06%     
==========================================
  Files         187      187              
  Lines       39090    39084       -6     
==========================================
- Hits        17146    17123      -23     
- Misses      20860    20879      +19     
+ Partials     1084     1082       -2     

Impacted Files	Coverage Δ
jobsdb/readonly_jobsdb.go	34.48% <0.00%> (ø)
processor/processor.go	71.23% <ø> (-0.68%)	⬇️
jobsdb/setup.go	90.47% <33.33%> (-0.44%)	⬇️
jobsdb/jobsdb_utils.go	78.57% <100.00%> (ø)
router/router.go	66.76% <100.00%> (ø)
services/stats/stats.go	88.48% <0.00%> (-1.82%)	⬇️
enterprise/reporting/reporting.go	8.33% <0.00%> (-1.44%)	⬇️
config/backend-config/namespace_config.go	73.95% <0.00%> (+3.12%)	⬆️

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[koladilip]

LGTM, but why are we removing enableGateway flag?

[cisse21]

It's by default true right , I don't think there is any case in gatewayAppHandler and embeddedAppHandler where we use enableGateway as false