feat(SLSRE-371): add hidden options for setting master/infra machine types with rosa create cluster

[Ajpantuso]

Summary

Adds hidden options to set both Master and Infra node types for Classic clusters to enable testing of regions where [m|r]5 instances are not available and provisioning would normally fail.

Closes SLSRE-371

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Ajpantuso
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[Ajpantuso]

/retest-required

[openshift-ci]

@Ajpantuso: all tests passed!

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[codecov]

Codecov Report

❌ Patch coverage is 70.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 27.77%. Comparing base (ec0065b) to head (18671f7).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/ocm/clusters.go	0.00%	4 Missing ⚠️
cmd/create/cluster/cmd.go	87.50%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3007      +/-   ##
==========================================
+ Coverage   27.74%   27.77%   +0.02%     
==========================================
  Files         315      315              
  Lines       34796    34816      +20     
==========================================
+ Hits         9655     9669      +14     
- Misses      24489    24495       +6     
  Partials      652      652              

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