Remove duplicate tool panel insertion, rely on activity bar

[guerler]

When displaying published items such as Workflows and Pages, a second, duplicate tool panel appears. One is displayed in the context of the activity bar, and the second one is inserted manually. This PR resolves this by removing the duplicate tool panel insertion.

How to test the changes?

(Select all options that apply)

• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.

[mvdbeek]

Does that only apply to dev or is this also an issue on 24.0 ?

[guerler]

Thanks for the review. Only applies to dev. In release this condition here avoids panel duplication: https://github.com/galaxyproject/galaxy/pull/17701/files#diff-1b3f63450eafc7d09add7008cc29ff519aac6103c7f4d167f0bc5207cc9b4b91L19. Added a commit to remove the now unused property.