Make style dialogs more global

[kmcginnes]

Description

When accessing the style dialog from the graph context menu, Graph Explorer would switch to the node/edge style sidebar then show the dialog. This doesn't make much sense to do.

Now the dialog is hosted by the GraphExplorer, which is the root of the route. So, the dialog can be shown without switching to the correct side bar first.

I also changed it so that the node/edge no longer is selected.

Validation

• Tested customize node/edge from context menu
• Tested customize node/edge from sidebar panels
• Tested with auto open details toggled on

Related Issues

• Part of Customization dialog does not show on first attempt #1283

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0
  license.
• I have run pnpm checks to ensure code compiles and meets standards.
• I have run pnpm test to check if all tests are passing.
• I have covered new added functionality with unit tests if necessary.
• I have added an entry in the Changelog.md.