Fix Deploy Epoch helper utility

[jordanschalm]

This PR fixes some problems with the util epochs deploy-tx-args helper command:

• Moves the contract code into a variable defined within the transaction text, rather than a transaction argument
• Fixes a transaction argument type

⚠️ Merge #1171 first

[codecov-commenter]

Codecov Report

Merging #1113 (26c1b10) into master (814b004) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1113      +/-   ##
==========================================
- Coverage   55.71%   55.69%   -0.03%     
==========================================
  Files         482      482              
  Lines       29644    29663      +19     
==========================================
+ Hits        16517    16520       +3     
- Misses      10864    10881      +17     
+ Partials     2263     2262       -1     

Flag	Coverage Δ
unittests	55.69% <0.00%> (-0.03%)	⬇️

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

Impacted Files	Coverage Δ
cmd/util/cmd/epochs/cmd/deploy.go	7.81% <0.00%> (-1.37%)	⬇️
engine/common/synchronization/engine.go	67.20% <0.00%> (ø)
cmd/util/ledger/migrations/storage_v4.go	42.16% <0.00%> (+0.60%)	⬆️
...sus/approvals/assignment_collector_statemachine.go	51.92% <0.00%> (+1.92%)	⬆️

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[jordanschalm]

bors merge

[bors]

Build succeeded:

• Integration Tests (1.15)
• Integration Tests (1.16)
• Lint
• Unit Tests (1.15)
• Unit Tests (1.16)