refactor: internal migration in postgres

[Sidddddarth]

Description

Rudder server triggers internal migration when required. No longer job fetching and then copying into new DS.
Does so using a insert into newDS (select * from oldDS where non-terminal) statement.

Notion Ticket

Perform internal migrations using insert into select statements

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: 43.95% // Increases project coverage by +0.09% 🎉

Coverage data is based on head (beb21b6) compared to base (8444433).
Patch coverage: 85.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2559      +/-   ##
==========================================
+ Coverage   43.86%   43.95%   +0.09%     
==========================================
  Files         187      187              
  Lines       39084    39059      -25     
==========================================
+ Hits        17144    17169      +25     
+ Misses      20856    20808      -48     
+ Partials     1084     1082       -2     

Impacted Files	Coverage Δ
services/streammanager/bqstream/bqstreammanager.go	71.59% <69.69%> (+38.69%)	⬆️
jobsdb/jobsdb.go	68.05% <92.53%> (+0.38%)	⬆️
config/backend-config/namespace_config.go	70.83% <0.00%> (-3.13%)	⬇️
utils/httputil/server.go	92.30% <0.00%> (+11.53%)	⬆️

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[atzoum]

Please add a test verifying that incomplete jobs are migrated properly