DYN-7898: dynamo losing focus fix

[dnenov]

Purpose

Addressed Dynamo loses focus when closing Package Manager window by explicitly returning focus to Dynamo after the PM is closed.

Changes

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

• now activates explicitly to bring back focus to Dynamo after the PM is closed

Reviewers

@QilongTang
@avidit

FYIs

@reddyashish

[github-actions]

See the ticket for this pull request: https://jira.autodesk.com/browse/DYN-7898

[github-actions]

UI Smoke Tests

Test: success. 11 passed, 0 failed.
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