Revert fee policy

[rokn]

Detailed description: This PR reverts the fee policy functionality so it doesn't block us from fixing the branching strategy

Special notes for your reviewer:

Checklist

• [ ] Documentation added
• [ ] Tests updated

[codecov[bot]]

Codecov Report

Merging #876 (f680a0f) into main (662b096) will decrease coverage by 1.06%. The diff coverage is 88.00%.

@@            Coverage Diff             @@
##             main     #876      +/-   ##
==========================================
- Coverage   64.49%   63.44%   -1.06%     
==========================================
  Files          88       82       -6     
  Lines        6780     6376     -404     
==========================================
- Hits         4373     4045     -328     
+ Misses       2187     2127      -60     
+ Partials      220      204      -16     

Flag	Coverage Δ
unittests	63.44% <88.00%> (-1.06%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
app/services/contracts/service.go	0.00% <ø> (ø)
app/process/handler/message/handler.go	63.49% <25.00%> (+1.72%)	:arrow_up:
app/model/auth-message/auth-message.go	36.28% <100.00%> (-8.62%)	:arrow_down:
app/services/fee/calculator/calculator.go	65.62% <100.00%> (-3.82%)	:arrow_down:
app/services/messages/service.go	63.50% <100.00%> (-3.17%)	:arrow_down:

... and 1 file with indirect coverage changes

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