fix: Add override instance type for running instances in MixedInstancePolicy

[eytan-avisror]

Signed-off-by: Eytan Avisror eytan_avisror@intuit.com
Fixes #349

[codecov]

Codecov Report

Merging #350 (ff7960a) into master (3adb8e4) will increase coverage by 0.11%.
The diff coverage is 84.61%.

@@            Coverage Diff             @@
##           master     #350      +/-   ##
==========================================
+ Coverage   51.17%   51.29%   +0.11%     
==========================================
  Files          33       33              
  Lines        4516     4533      +17     
==========================================
+ Hits         2311     2325      +14     
- Misses       2063     2064       +1     
- Partials      142      144       +2     

Impacted Files	Coverage Δ
controllers/provisioners/eks/cloud.go	85.77% <71.42%> (-0.43%)	⬇️
controllers/provisioners/eks/helpers.go	91.30% <89.47%> (-0.16%)	⬇️
controllers/provisioners/eks/eks.go	89.58% <0.00%> (+2.08%)	⬆️

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