#1763 add logic to retrieve existing edge to CreateEdgesStep

[robfrank]

What does this PR do?

REwork of #1911

Motivation

Some tests are failing after merge of PR #1911

Related issues

issues: #1763

Checklist

• I have run the build using mvn clean package command
• My unit tests cover both failure and success scenarios

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.46%	✅ 59.38%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (971b6a8)	68176	43654	64.03%
Head commit (df37359)	68195 (+19)	43977 (+323)	64.49% (+0.46%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1914)	32	19	59.38%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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