Iv ocex tests

[35359595]

Describe your changes

Missing tests for OCEX pallet added extrinsics:

• remove_proxy
• set_snapshot
• change_pending_withdrawal_limit
• change_snapshot_interval_block
• set_exchange_state
• whitelist_orderbook_operator

Checklist before requesting a review

• I have performed a self-review of my code.
• If it is a core feature, I have added thorough tests.
• I removed all Clippy and Formatting Warnings.
• I added required Copyrights.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.77 🎉

Comparison is base (9ede724) 33.82% compared to head (258b13a) 34.60%.

Additional details and impacted files

@@             Coverage Diff             @@
##           Develop     #819      +/-   ##
===========================================
+ Coverage    33.82%   34.60%   +0.77%     
===========================================
  Files           64       64              
  Lines         4381     4381              
===========================================
+ Hits          1482     1516      +34     
+ Misses        2899     2865      -34     

see 1 file with indirect coverage changes

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