Remove deviceChallenge.enhancedPollingEnabled check to be default behavior

[SohamKolhatkar-okta]

Description:

• First, we removed the property from monolith (PR - merged in 2025.08.4 weekly CF). No issues or regressions reported.
• Now, we can safely remove the corresponding SIW check.
  • As recommended by Shaw, the SIW check handles pinned SIW versions to prevent regressions.

  // Enter if-statement when deviceChallenge.enhancedPollingEnabled is true or undefined
  // Therefore, SIW behavior is unchanged when the true-by-default property is removed.
  if (deviceChallenge.enhancedPollingEnabled !== false) {
      ...
  }
  

• I ran the following command to verify tests locally:

yarn test -t testcafe chrome test/testcafe/spec/ChallengeOktaVerifyFastPassView_spec.js

PR Checklist

• Have you verified the basic functionality for this change?
• Did you add tests, as appropriate, following our Automated Test guidelines?
• Did you follow our Security Best Practices?
• Did you verify the change by running downstream monolith artifact? (Provide link to build below)
• Does this PR include noticeable changes to the UI? (If yes, attach screenshots/video below)

Issue:

• OKTA-999700

Reviewers:

Screenshot/Video:

Downstream Monolith Build: