feat(jmt): update getClientJMT calculations

[gabrielchl]

COMPLETES https://jira-eng-gpk2.cisco.com/jira/browse/SPARK-782074

This pull request addresses

inaccuracies in getClientJMT calculations

by making the following changes

using the right latencies to calculate getCleintJMT

Change Type

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Tooling change
• Internal code refactor

The following scenarios were tested

< ENUMERATE TESTS PERFORMED, WHETHER MANUAL OR AUTOMATED >

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• This PR is related to
  • Feature
  • Defect fix
  • Tech Debt
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I certified that

• I have read and followed contributing guidelines
• I discussed changes with code owners prior to submitting this pull request
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• All existing and new tests passed
• I have updated the documentation accordingly

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[gabrielchl]

we wanna leave this for last, esp. after natalia's PR to modify clickToInterstitial calc goes in, leaving as a draft pr for now