fix: Match Firecracker 1.0.0 API

[yitsushi]

What this PR does / why we need it:

I left the AllowMMDSRequests on our side of API, because it think it
makes sense to specify per interface, and under the hood, the
Firecracker provider knows how to handle it.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #384

Special notes for your reviewer:

Checklist:

• squashed commits into logical changes
• includes documentation
• adds unit tests
• adds or updates e2e tests

[codecov-commenter]

Codecov Report

Merging #385 (e971b1f) into main (f135e32) will decrease coverage by 0.04%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #385      +/-   ##
==========================================
- Coverage   56.67%   56.62%   -0.05%     
==========================================
  Files          52       52              
  Lines        2599     2603       +4     
==========================================
+ Hits         1473     1474       +1     
- Misses       1002     1004       +2     
- Partials      124      125       +1     

Impacted Files	Coverage Δ
infrastructure/firecracker/config.go	0.00% <0.00%> (ø)
pkg/process/process.go	37.73% <0.00%> (-1.89%)	⬇️
infrastructure/containerd/event_service.go	59.64% <0.00%> (+3.50%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f135e32...e971b1f. Read the comment docs.

[richardcase]

Seems reasonable to me.