fix: Updates to RStudio Integration tests

[nguyen102]

Issue #, if available:

Description of changes:

• Remove extraneous comments
• Don't run rstudio tests if rstudio config is 'N/A'
• Move advanced tests into common folder so they get executed

Checklist:

• Have you successfully deployed to an AWS account with your changes?
• Have you written new tests for your core changes, as applicable?
• Have you successfully tested with your changes locally?
• If new dependencies have been added, have they been pinned to specific versions?
• Is this change also required on the AWS Solution version?
• Have you updated openapi.yaml if you made updates to API definition (including add, delete or update parameter and request data schema)?
• If you had to run manual tests, have you considered automating those tests by adding them to end-to-end tests?
• If you are updating the changelog and vending out a new release, have you updated versionNumber and versionDate in .defaults.yml

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 #818 (9b67a86) into develop (bb9e457) will not change coverage.
The diff coverage is n/a.

❗ Current head 9b67a86 differs from pull request most recent head 7078b6d. Consider uploading reports for the commit 7078b6d to get more accurate results

@@           Coverage Diff            @@
##           develop     #818   +/-   ##
========================================
  Coverage    50.91%   50.91%           
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  Files          286      286           
  Lines        15931    15931           
  Branches      2485     2485           
========================================
  Hits          8111     8111           
  Misses        6863     6863           
  Partials       957      957           

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[nguyen102]

Note: Before we can merge this PR in, we need to refactor the Cypress AppStream disabled workspace test to terminate workspaces that it launches. This is because the RStudio Integration test checks that all RStudio instances are terminated, before it runs.

An example of how to refactor the Cypress AppStream disabled workspace tests.

[SanketD92]

Terminated RStudio instances manually on the e2e test environment. PR for automatic termination depends on this PR merge.