Suppress dead code warnings for blocks with errors (FuelLabs#4003)

## Description

Closes FuelLabs#4000 and
FuelLabs#3803

Before:

<img width="461" alt="image"
src="https://user-images.githubusercontent.com/47993817/217112557-ff19f56c-a708-4542-9156-b703a7df44c3.png">


After: 

<img width="467" alt="image"
src="https://user-images.githubusercontent.com/47993817/217112380-894cee1a-2980-439f-b2c1-d9eea1aa5f2c.png">


## Checklist

- [x] I have linked to any relevant issues.
- [x] I have commented my code, particularly in hard-to-understand
areas.
- [ ] I have updated the documentation where relevant (API docs, the
reference, and the Sway book).
- [ ] I have added tests that prove my fix is effective or that my
feature works.
- [ ] I have added (or requested a maintainer to add) the necessary
`Breaking*` or `New Feature` labels where relevant.
- [x] I have done my best to ensure that my PR adheres to [the Fuel Labs
Code Review
Standards](https://github.com/FuelLabs/rfcs/blob/master/text/code-standards/external-contributors.md).
- [x] I have requested a review from the relevant team or maintainers.

Co-authored-by: Mohammad Fawaz <[email protected]>