fix: set condition for public route table

[SanketD92]

Issue #, if available:
N/A

Description of changes:
Output param condition for non-TRE resource.

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

❗ No coverage uploaded for pull request base (feat-rstudio-alb@b702cf8). Click here to learn what that means.
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@@                 Coverage Diff                 @@
##             feat-rstudio-alb     #810   +/-   ##
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  Coverage                    ?   52.48%           
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  Files                       ?      279           
  Lines                       ?    15301           
  Branches                    ?     2365           
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  Hits                        ?     8030           
  Misses                      ?     6396           
  Partials                    ?      875           

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