fix: allow RStudio EC2 to initialize

[SanketD92]

Issue #, if available:
SSM params are created after RStudio EC2 is fully initialized (takes 60-90 seconds).

Description of changes:
Adding a wait time of 60-90 seconds in RStudio integration test.

Checklist:

• Have you successfully deployed to an AWS account with your changes?
• Have you successfully tested with your changes locally?

AS review ticket id:

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #821 (12b9874) into develop (eb879fe) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #821   +/-   ##
========================================
  Coverage    50.91%   50.91%           
========================================
  Files          286      286           
  Lines        15931    15931           
  Branches      2485     2485           
========================================
  Hits          8111     8111           
  Misses        6863     6863           
  Partials       957      957           

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[maghirardelli]

LGTM