Refactor InvocationScrollList for re-use

[mvdbeek]

We have multiple <Item>ScrollList components, and I want to add another without leaving things in a worse state ...
It's a little tangential to what I'm doing but anyone interested could pick this up and refactor the other <Item>ScrollList components.

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.