PR - Jira Issues: [DYN-4095] Cleanup layout rearranges pin and node

[M-JULIANI]

Description

Fixes a previous bug visible when running Cleanup Layout. When selecting a single node and running the command multiple
times, any connector pin in the graph moved upwards.

Fixed behaviour:

This PR also adds a HasUnsavedChanges flag when calling BreakConnection from a port.

Fixed behaviour:

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated

Reviewers

@QilongTang

FYIs

@SHKnudsen
@Amoursol

[QilongTang]

LGTM with one comment