DYN-8308: Fix temporary connector and Node memory leak

[zeusongit]

Purpose

Based on #15832

It was identified that when working with connectors, the temporary connectors (dotted wires) were not properly disposed, the PR disposes them properly when the wire connection is made.

Also, added a few more unsubscription related to nodes.

Results:

Tested twice with VS Memory Profiler.
Action: Opened Mars graph and closed twice in the same session.

After (Left) : Before (Right)

NodeViewModel (Inclusive of all child elements size):
Before: ~150 MB
After: ~10MB
~93% drop
(The drop was due to node leak fix, as no interaction was done with wires when testing)

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
• This PR contains no files larger than 50 MB

Release Notes

• Fix temporary connector and Node memory leak

Reviewers

@DynamoDS/eidos

[github-actions]

See the ticket for this pull request: https://jira.autodesk.com/browse/DYN-8308

[RobertGlobant20]

LGTM