Fix bug for scale-in protection

[tevoinea]

Summary of the Pull Request

What is this about?

Fixes a bug where we return OneFuzzResult.Ok even if applying scale in protection wasn't OK.

PR Checklist

• Applies to work item: #xxx
• CLA signed. If not, go over here and sign the CLI.
• Tests added/passed
• Requires documentation to be updated
• I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx

Info on Pull Request

What does this include?

• Only return OK if acquiring scale-in protection was successful
• Add metrics

Validation Steps Performed

How does someone test & validate?

Will be validating in check-pr

[codecov-commenter]

Codecov Report

Merging #3144 (7d23204) into main (98007be) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #3144      +/-   ##
==========================================
- Coverage   31.61%   31.60%   -0.02%     
==========================================
  Files         308      308              
  Lines       36535    36551      +16     
==========================================
  Hits        11552    11552              
- Misses      24983    24999      +16     

Impacted Files	Coverage Δ
...piService/ApiService/Functions/AgentCanSchedule.cs	0.00% <0.00%> (ø)
...ApiService/ApiService/onefuzzlib/NodeOperations.cs	22.32% <0.00%> (-0.54%)	⬇️