Uses scriptworker-k8s scriptworkers

[mitchhentges]

This is another change for the Taskcluster instance migration.

Checklist

• Confirm the acceptance criteria is fully satisfied in the issue(s) this PR will close
• Add thorough tests or an explanation of why it does not
• Add a CHANGELOG entry if applicable
• Add QA labels on the associated issue (not this PR; qa-ready or qa-notneeded)

[codecov-io]

Codecov Report

Merging #2953 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2953      +/-   ##
============================================
- Coverage      52.1%   52.07%   -0.03%     
+ Complexity      481      479       -2     
============================================
  Files           123      123              
  Lines          3520     3520              
  Branches        452      452              
============================================
- Hits           1834     1833       -1     
- Misses         1535     1537       +2     
+ Partials        151      150       -1

Impacted Files	Coverage Δ	Complexity Δ
.../org/mozilla/tv/firefox/channels/DefaultChannel.kt	75% <0%> (-8.34%)	6% <0%> (-2%)
...fox/navigationoverlay/NavigationOverlayFragment.kt	63.86% <0%> (ø)	27% <0%> (ø)	⬇️

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[MihaiTabara]

Piggy-backing on this PR to fix the rest of the workerTypes too.