Fixes #4627 Adds v2 and v3 onion service variables

[kushaldas]

Status

Ready for review

Description of Changes

Fixes #4627

Adds the two new variables on the site-specific file, these variables
will be used in the future code changes.
Also adds 3 test cases for the same.

Testing

cd admin
make test

Deployment

Any special considerations for deployment? Consider both:

1. Upgrading existing production instances.
2. New installs.

Checklist

If you made changes to the server application code:

• Linting (make lint) and tests (make -C securedrop test) pass in the development container

If you made changes to securedrop-admin:

• Linting and tests (make -C admin test) pass in the admin development container

If you made changes to the system configuration:

• Configuration tests pass

If you made non-trivial code changes:

• I have written a test plan and validated it for this PR

If you made changes to documentation:

• Doc linting (make docs-lint) passed locally

[codecov-io]

Codecov Report

Merging #4648 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #4648   +/-   ##
========================================
  Coverage    82.72%   82.72%           
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  Files           45       45           
  Lines         3120     3120           
  Branches       337      337           
========================================
  Hits          2581     2581           
  Misses         453      453           
  Partials        86       86

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[emkll]

Thanks @kushaldas LGTM. Local testing in a Tails VM confirms the behavior is as described in #4627 :

• if there's an app-source-ths with a v2 onion url, v2_onion_services and v3_onion_services are True.
• if there's an app-source-ths with a v3 onion url, v2_onion_services is False and v3_onion_services is set to True.
• No app-source-ths results in v2_onion_services is False and v3_onion_services is set to True