Fixes bootstrap key Machine Account Key bug

[danuio]

• Fixes a bug where the machine account key is created for all nodes
• Machine account key is now only created for consensus and collection nodes

[codecov-commenter]

Codecov Report

Merging #1092 (06aeaff) into master (4dde0e3) will increase coverage by 0.01%.
The diff coverage is 57.14%.

@@            Coverage Diff             @@
##           master    #1092      +/-   ##
==========================================
+ Coverage   53.14%   53.15%   +0.01%     
==========================================
  Files         321      321              
  Lines       21725    21730       +5     
==========================================
+ Hits        11545    11551       +6     
+ Misses       8614     8610       -4     
- Partials     1566     1569       +3     

Flag	Coverage Δ
unittests	53.15% <57.14%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/bootstrap/cmd/key.go	71.01% <57.14%> (-0.87%)	⬇️
...sus/approvals/assignment_collector_statemachine.go	45.19% <0.00%> (+2.88%)	⬆️

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