[Utility] Handle Errors During Transaction Processing

[Olshansk]

Objective

Make sure that transaction processing errors are handled correctly when an issue is seen during the ApplyBlock process in utility/block.go.

Origin Document

This task was meant to be tackled in #315, but while reviewing #285, the team realized it was left out:

An error during transaction processing could happen due to a multitude of reasons:

• Invalid Transaction
• Internal Error
• Nil Transactions
• Etc...

Goals

• Identify the different situations in which transaction processing could result in an error
• Design & implement Handle the different situations identified above

Deliverable

• A PR that implements this error management
• Unit tests handling the various situations that could cause transaction processing errors
• Updated documentation on different reasons transaction processing could error

Non-goals / Non-deliverables

• Updates to interfaces exposed by the modules
• New business logic related to Pocket utility

General issue deliverables

• Update the appropriate CHANGELOG
• Update any relevant READMEs (local and/or global)
• Update any relevant global documentation & references
• If applicable, update the source code tree explanation
• If applicable, add or update a state, sequence or flowchart diagram using mermaid

Testing Methodology

• New tests: <UPDATE_ME>
• All tests: make test_all
• LocalNet: verify a LocalNet is still functioning correctly by following the instructions at docs/development/README.md

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Creator: @Olshansk
Co-Owners: @andrewnguyen22