Gh-3200: Additional Federated Stores Tinkerpop tests

[cn337131]

Added a few more tests of a federated store with a GafferPopGraph. These test whether the .with() config options allow users to specify the graph they wish to target for results using Gremlin.

Also an additional fix in GafferPopGraph which prevented Gremlin queries seeding with edge IDs in cases where edges were not directed.

Note: docs will need to be added that explain to users how to use the .with() to query federated graphs.

Related issue

• Resolve Add additional tinkerpop tests to ensure config options work with FederatedStores  #3200

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.86%. Comparing base (49a8d38) to head (c08d63d).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #3204      +/-   ##
=============================================
- Coverage      66.87%   66.86%   -0.02%     
+ Complexity      2558     2556       -2     
=============================================
  Files            912      912              
  Lines          29284    29284              
  Branches        3268     3268              
=============================================
- Hits           19584    19580       -4     
- Misses          8256     8258       +2     
- Partials        1444     1446       +2     

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