Smart Contracts: reschedule triggers on node responsiveness timeout

[bchamagne]

Description

When a resulting contract's transaction fails to be validated, we reschedule it. Fixes #1547

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Scenario:

• start 2 nodes

• create a contract that will create a failing transaction

  @version 1
  
  actions triggered_by: datetime, at: 1848657600 do
  Contract.set_content "that's all folks"
  end
  
  actions triggered_by: interval, at: "* * * * *" do
  Contract.add_uco_transfer to: "00000000000000000000000000000000000000000000000000000000000000000000", amount: 1_000_000_000
  end

• the contract should run every minute even if the transaction cannot be validated (Insufficient funds).

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules