docs: update setup and test docs with missing info (#4567)

## What ❔

Fixes the development setup docs to accurately reflect some missing
information
- cargo-nextest must be installed with `--version 0.9.109 --locked` as
the latest version does not support rust 1.87
- `zkstack dev contracts` must be run before running unit tests
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## Why ❔

Accurate documentation is helpful for new and external contributors to
be able to set up a working developer environment

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are the principles behind them? -->
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## Is this a breaking change?
- [ ] Yes
- [x] No

## Operational changes
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None

## Checklist

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- [ ] PR title corresponds to the body of PR (we generate changelog
entries from PRs).
- [ ] Tests for the changes have been added / updated.
- [ ] Documentation comments have been added / updated.
- [ ] Code has been formatted via `zkstack dev fmt` and `zkstack dev
lint`.

Author: coffeexcoin

docs/src/guides/development.md

@@ -123,6 +123,12 @@ Commands:
 
 ### Running unit tests
 
+Unit tests require preprocessed artifacts from the contracts submodule. These can be prepared by running:
+
+```bash
+zkstack dev contracts
+```
+
 You can run unit tests for the Rust crates in the project by running:
 
 ```bash

docs/src/guides/setup-dev.md

@@ -41,7 +41,7 @@ npm install -g yarn
 yarn set version 1.22.19
 
 # For running unit tests
-cargo install cargo-nextest
+cargo install cargo-nextest --version 0.9.109 --locked
 # SQL tools
 cargo install sqlx-cli --version 0.8.1