Gh-3319: Fixes ability to get orphan vertices from edges

[cn337131]

Fix that allows users to get the 'orphan' vertices from edges that have no associated entities.
Also change to GetSchema op when creating a view to allow use of opOperations in GafferPop.

Related issue

• Resolve GafferPop support for edges with no entities #3319

[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 2 lines in your changes missing coverage. Please review.

Project coverage is 67.90%. Comparing base (2b89f94) to head (f756c5e).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
...rpop/process/traversal/util/GafferVertexUtils.java	81.81%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #3320      +/-   ##
=============================================
- Coverage      67.91%   67.90%   -0.01%     
  Complexity      2596     2596              
=============================================
  Files            952      952              
  Lines          30469    30492      +23     
  Branches        3361     3363       +2     
=============================================
+ Hits           20692    20706      +14     
- Misses          8305     8310       +5     
- Partials        1472     1476       +4     

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[sonarqubecloud]

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