[24.0] Skip tests if toolshed, dx.doi not responding

[mvdbeek]

There's probably more to consider but that should already help out a bit.

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.

[galaxyproject-sentryintegration]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ HTTPError: 404 Client Error: Not Found for url: https://www.doi.org/doi.org/10.1007/978-3-319-24277-4 https://127.0.0.1:8081/api/tools/toolshed.g2.bx... View Issue

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