Update CAPI to v1.8.1

[thunderboltsid]

• Add a build-e2e target to
• Clean up existing build target deps
• refactor tests and controllers to match updated dependencies

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 89.74359% with 4 lines in your changes missing coverage. Please review.

Project coverage is 32.56%. Comparing base (bf5ce6b) to head (58e345a). Report is 1 commits behind head on main.

Files	Patch %	Lines
main.go	42.85%	2 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #476 +/- ## ========================================== + Coverage 32.34% 32.56% +0.21% ========================================== Files 17 17 Lines 1830 1833 +3 ========================================== + Hits 592 597 +5 + Misses 1217 1216 -1 + Partials 21 20 -1 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[thunderboltsid]

@thunderboltsid don't you need also to update devbox clusterctl dependency to 1.8.1 ??

nixpkgs don't have 1.8.1 yet only 1.8.0.