Fix base not working with server actions

[lowet84]

Changes

Server actions was using the url "/_actions/command" despite setting a base url.
If base is set to "/base" url should be "/base/_actions/command"

Updated how actions parse action-name
Updated "actions.mjs" to include base path in the client.

Testing

Updated all tests in actions to include a base path in the fixture as. well as a base path in the tests.

Docs

Docs probably don't need changing.

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[ematipico]

Updated all tests in actions to include a base path in the fixture as. well as a base path in the tests.

I believe there's no need to update all tests. I believe you can create one new test where you set a custom base.

[lowet84]

What I would actually like to do is to run all the existing tests with both base and no base. I managed to get one of the tests to fail during dev and that spooked me a bit. I'll look for a suitable simplification of the tests.

[lowet84]

I moved the base path test to a separate test. If you believe this is sufficient, that's fine but I'm a bit worried that all functionality is not being tested using base path.

[ematipico]

I moved the base path test to a separate test. If you believe this is sufficient, that's fine but I'm a bit worried that all functionality is not being tested using base path.

Then create new tests with the functionality you want to tests. If you move all tests to use the base, you get the opposite result: all is tested with the base, and none is tested without the base.