[fix] Reconcile firewall ref if there is no firewall ID on linode machine

[sammysclub]

What this PR does / why we need it: When a linode machine has a firewall ref but no firewall ID, the firewall will not get reattached to the machine if it gets detached (ex: during cluster pivot). Tested using the developer instructions with make local-deploy and basic cluster (already has a linodeMachine with a firewallRef and no firewallID)

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 #

Special notes for your reviewer:

TODOs:

• squashed commits
• includes documentation
• adds unit tests
• adds or updates e2e tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.34%. Comparing base (50188d8) to head (6c1606b).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #920      +/-   ##
==========================================
+ Coverage   66.28%   66.34%   +0.06%     
==========================================
  Files          71       71              
  Lines        7957     7961       +4     
==========================================
+ Hits         5274     5282       +8     
+ Misses       2381     2378       -3     
+ Partials      302      301       -1     

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