feat(BUX-417): remove monitor, ITC flag and IncomingTransaction

[pawellewandowski98]

Description

• Removed monitor
• Removed ITC (Internal transaction check) flag and IncomingTransaction model. ITC flag was checked only in one place -during recording external incoming transaction. After we switched to paymail transaction this check was never possible to be passed. IncomingTransaction was only used after this check and for transactions which do not have to be broadcasted right away and can be checked in cron task. Now every new transaction have to be broadcasted so main assumption for IncomingTransaction can not be performed so it is useless.

Pull Request Checklist

• 📖 I created my PR using provided : CODE_STANDARDS
• 📖 I have read the short Code of Conduct: CODE_OF_CONDUCT
• 🏠 I tested my changes locally.
• ✅ I have provided tests for my changes.
• 📝 I have used conventional commits.
• 📗 I have updated any related documentation.
• 💾 PR was issued based on the Github or Jira issue.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (9081074) 51.88% compared to head (c564ccc) 55.19%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #532      +/-   ##
==========================================
+ Coverage   51.88%   55.19%   +3.31%     
==========================================
  Files         109      104       -5     
  Lines       11250    10316     -934     
==========================================
- Hits         5837     5694     -143     
+ Misses       4946     4177     -769     
+ Partials      467      445      -22     

Flag	Coverage Δ
unittests	55.19% <33.33%> (+3.31%)	⬆️

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

Files	Coverage Δ
action_destination.go	55.89% <100.00%> (+3.24%)	⬆️
chainstate/chainstate.go	76.59% <ø> (+3.12%)	⬆️
chainstate/client.go	70.45% <ø> (+4.49%)	⬆️
chainstate/client_options.go	75.53% <ø> (+7.91%)	⬆️
client.go	65.57% <ø> (+5.07%)	⬆️
client_internal.go	94.48% <ø> (+21.76%)	⬆️
client_options.go	75.30% <ø> (-0.42%)	⬇️
cron_job_declarations.go	85.00% <ø> (-2.50%)	⬇️
cron_job_definitions.go	0.00% <ø> (ø)
locks.go	100.00% <ø> (ø)
... and 5 more

... and 2 files with indirect coverage changes

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