command/import: remove -provider command line argument

[mildwonkey]

Now that #22862 has been merged, terraform will properly pick up the
resource provider configuration from state. We can therefore remove the deprecated
-provider flag.

[apparentlymart]

Part of me wants to keep the -provider argument definition above and make it generate a helpful error message below if it's non-empty. 🤔

With that said, I don't have a ready-to-go suggestion here for an actionable direction that error message could give. "Specify the provider in the configuration instead" is the gist of it, but I expect that most folks won't really know what to do about it.

So with all of that said, I think it'll be okay to just break this here and then we can describe the migration path in the changelog and/or upgrade guide where we'll have more "space" to describe what the resolution is and link to other relevant documentation.

[mildwonkey]

Thanks!
ps: I had not meant to remove your label, I believe we were labeling at the same time 🤷‍♀

[ghost]

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