Gh-3276: Add ability to seed with Vertex only in Gremlin

[cn337131]

This should allow users to seed a Gremlin query with a vertex that exists only on an edge and not as an individual entity.

Related issue

• Resolve Gremlin does not return vertex without Gaffer entity #3276

[codecov]

Codecov Report

Attention: Patch coverage is 90.47619% with 2 lines in your changes missing coverage. Please review.

Project coverage is 67.74%. Comparing base (16fd6a3) to head (d3eaa1c).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
...rpop/process/traversal/util/GafferVertexUtils.java	88.88%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #3286      +/-   ##
=============================================
+ Coverage      67.73%   67.74%   +0.01%     
  Complexity      2594     2594              
=============================================
  Files            945      946       +1     
  Lines          30160    30179      +19     
  Branches        3329     3331       +2     
=============================================
+ Hits           20428    20445      +17     
- Misses          8267     8268       +1     
- Partials        1465     1466       +1     

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud