Use popper wrapper for help text popover

[guerler]

Requires #19337. Improves alignment, arrow position, scrolling behavior and prevents help text popover to be cut off on small screens.

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Now:

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]

Cool, thank you!