Correct package install error dialog messages

[aparajit-pratap]

Purpose

JIRA issue: https://jira.autodesk.com/browse/DYN-2026

In the case of a conflicting custom node package being installed, the "Cannot Download Package" dialog said that the already loaded package first needs to be uninstalled by Dynamo and Dynamo restarted. Then the user would need to try installing the package again. However, in this case the conflicting package is still downloaded even though it isn't loaded in the current Dynamo session. If the user selects "Yes" in the dialog, the already loaded package is deleted when Dynamo is restarted and he/she is not expected to reinstall the second package as it was already downloaded previously. When Dynamo is restarted the second package loads successfully after the original conflicting package is deleted.

The dialog message is updated to reflect this behavior more clearly:
Before:

After:

In addition this fixes an issue in a similar dialog where the package version wasn't explicit in the error message:
Before:

After:

TODO:

• Cherry-pick into RC2.3.0 branch.

Declarations

Check these if you believe they are true

• The code base 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. [WIP]
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning, and are documented in the API Changes document.

Reviewers

@QilongTang @reddyashish

FYIs

@mjkkirschner

[QilongTang]

I was wondering about that during the demo! Thank you for fixing it!

[QilongTang]

LGTM