fixes #3694
depends on node-red-node-test-helper@0.3.0

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Discussed here: https://node-red.slack.com/archives/C9RSU6S56/p1655726225125419

Proposed changes

• Ensures registered nodes are removed from the cache to avoid the "Multiple nodes with name" error
• Adds a suitable test that loads a flow with 2 link nodes named the same then deploys a name change

NOTE: Depends on node-red-node-test-helper@0.3.0 #54 being merged and published

Checklist

• I have read the contribution guidelines
• For non-bugfix PRs, I have discussed this change on the forum/slack team.
• I have run grunt to verify the unit tests pass
• I have added suitable unit tests to cover the new/changed functionality