fix: remove legacy hosted code which changes connectionToken

[BonapartePC]

Description

Fixes PIPE-1470
remove legacy hosted code which changes connectionToken
Related to https://github.com/rudderlabs/cp-router/pull/200

Linear Ticket

https://linear.app/rudderstack/issue/PIPE-1470/choose-primary-namespace-for-cp-router-connection-for-warehouse

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

All modified and coverable lines are covered by tests ✅

Project coverage is 73.06%. Comparing base (33b5f63) to head (e9f3a12).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5126      +/-   ##
==========================================
- Coverage   73.06%   73.06%   -0.01%     
==========================================
  Files         437      437              
  Lines       50789    50787       -2     
==========================================
- Hits        37110    37108       -2     
+ Misses      11260    11258       -2     
- Partials     2419     2421       +2     

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