WS-HOT-FIX: Remove x6 and referrer values

[shayneahchoon]

Resolves JIRA: No-Jira

Summary

Removes x6 and referrer values so that reverb does not bucket click and view tracks as incorrect page view tracks. This will be merged in as a temporary fix while we make changes to the reverb-url-helper and deploy a new version of this package.

Code changes

• Removes x6 and referrer parameters on click and view tracks.

Developer Checklist

• UX
  • UX Criteria met (visual UX & screenreader UX)
• Accessibility
  • Accessibility Acceptance Criteria met
  • Accessibility swarm completed
  • Component Health updated
  • P1 accessibility bugs resolved
  • P2/P3 accessibility bugs planned (if not resolved)
• Security
  • Security issues addressed
  • Threat Model updated
• Documentation
  • Docs updated (runbook, READMEs)
• Testing
  • Feature tested on relevant environments
• Comms
  • Relevant parties notified of changes

Testing

• Manual Testing required?
  • Local (Ready-For-Test, Local)
  • Test (Ready-For-Test, Test)
  • Preview (Ready-For-Test, Preview)
  • Live (Ready-For-Test, Live)
• Manual Testing complete?
  • Local
  • Test
  • Preview
  • Live

Additional Testing Steps

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