Tune polling intervals for an overall faster ValidateEgress()

[abyrne55]

What does this PR do? / Related Issues / Jira

This PR speeds up ValidateEgress() but adjusting how often we're checking for serial console output (i.e., "the PollImmediate() loop") and if the EC2 instance has finished terminating. This means that we'll spend less time unnecessarily waiting if, e.g., an instance finishes terminating after 17 seconds, as the previous config would only have checked once at 15s and again at 30s, whereas this new config will check at 3s, 6s, 9s... 15s, and 18s.

Checklist

• I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have made corresponding change to the default configuration files
• [ ] I have added tests that prove my fix is effective or that my feature works
• I have tested the functionality against aws, it doesn't cause any regression
• [ ] I have added execution results to the PR's readme

How to test this PR locally / Special Instructions

Keep an eye out for previously unforeseen race conditions or API ratelimiting (unlikely given the still-long intervals). Otherwise, please test this PR as you would any other verifier PR.

[openshift-ci]

@abyrne55: all tests passed!

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 24.82%. Comparing base (8024971) to head (a9d80be).

Files	Patch %	Lines
pkg/clients/aws/aws.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #260      +/-   ##
==========================================
- Coverage   24.85%   24.82%   -0.03%     
==========================================
  Files          23       23              
  Lines        1738     1740       +2     
==========================================
  Hits          432      432              
- Misses       1284     1286       +2     
  Partials       22       22              

Files	Coverage Δ
pkg/verifier/aws/aws_verifier.go	35.94% <100.00%> (ø)
pkg/clients/aws/aws.go	8.33% <0.00%> (-0.24%)	⬇️

[rafael-azevedo]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rafael-azevedo

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