[MEX-437] remove exit amount from staking proxy unstake farm tokens

[claudiulataretu]

Reasoning

• staking proxy no longer require exit amount on unstake farm tokens transction

Proposed Changes

• removed exit amount from staking proxy unstake farm tokens

How to test

• N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.69%. Comparing base (8c52e7e) to head (c4fff4c).
Report is 1 commits behind head on feat/xexchange-v3.

❗ Current head c4fff4c differs from pull request most recent head 0eb002e. Consider uploading reports for the commit 0eb002e to get more accurate results

Additional details and impacted files

@@                Coverage Diff                 @@
##           feat/xexchange-v3    #1288   +/-   ##
==================================================
  Coverage              56.69%   56.69%           
==================================================
  Files                    242      242           
  Lines                   8622     8618    -4     
  Branches                 614      613    -1     
==================================================
- Hits                    4888     4886    -2     
+ Misses                  3197     3196    -1     
+ Partials                 537      536    -1     

Flag	Coverage Δ
unittests	56.69% <ø> (+<0.01%)	⬆️

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