fix!: launchNode.cleanup not killing node in last test of test group

[nedsalk]

• Closes Node started via launchTestNode isn't closed in tests #2712

Summary

Launching a fuel-core node via launchNode and killing it via the cleanup function wouldn't kill the last node in a test group because the test runner would exit before the node was killed and the node wouldn't get killed. The other nodes would get killed because there was enough time for the killing to happen before the last test finishes. Launching the nodes in a detached state and killing them via process.kill(-child.pid) did the trick.

Besides this, multiple cleanup cases have been ensured to work as a result of the discussion in #2718 (comment).

Breaking Changes

The killNode and KillNodeParams functionality has been internalized and the method and interface have been deleted so they're no longer exported. It's marked as a breaking change for pedantic reasons and there shouldn't really be any affected users given that they kill nodes via cleanup which is unchanged, so no migration notes are necessary.

Checklist

• I added — tests to prove my changes
• I updated — all the necessary docs
• I reviewed — the entire PR myself, using the GitHub UI
• I described — all breaking changes and the Migration Guide

[maschad]

Nice job on this, ran it locally and pgrep fuel-core comes back clean 😄 (As opposed to master which will report a pid)

Left some comments

[maschad]

Nice job!

[github-actions]

Coverage Report:

Lines	Branches	Functions	Statements
79.41%(+0%)	71.65%(-0.02%)	77.3%(+0.27%)	79.54%(+0.06%)

Changed Files:

Ok	File (✨=New File)	Lines	Branches	Functions	Statements
🔴	packages/account/src/test-utils/launchNode.ts	98.26% (-1.74%)	84.74% (-1.22%)	100% (+21.43%)	98.34% (+3.43%)