DYN-7332: improvements after comments

[ivaylo-matov]

Purpose

PR to address DYN-7332 and this Slack thread .

• Pins are now automatically added to a group when created, if both the start and end nodes are in the same group.
• Pins are selected when right-clicked, making it easier to interact with them.
• The "Remove from Group" option is now updated correctly, so it becomes greyed out when the pin is no longer in a group, without needing to deselect and reselect the pin.

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

Pins can now be added or removed from groups.

Reviewers

@QilongTang
@reddyashish

FYIs

@dnenov
@Amoursol

[github-actions]

See the ticket for this pull request: https://jira.autodesk.com/browse/DYN-7332

[github-actions]

UI Smoke Tests

Test: success. 11 passed, 0 failed.
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