feat(e2e): Add test-case for currency-pair removals in e2e

[nivasan1]

In This PR

• I introduce a test-case to test that slinky is able to support currency-pair removals

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 56.79%. Comparing base (e51e6c2) to head (2574467).

Files	Patch %	Lines
x/oracle/module.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #341   +/-   ##
=======================================
  Coverage   56.78%   56.79%           
=======================================
  Files         227      227           
  Lines       10761    10763    +2     
=======================================
+ Hits         6111     6113    +2     
  Misses       4138     4138           
  Partials      512      512           

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