Unclear how to use ctx.resolve_command

[laurentlb]

It's unclear how to use ctx.resolve_command. Many people pass the command down to ctx.actions.run_shell, but it no longer accepts a list for the command argument.

This message was written by @keith in #5903 (comment) (see the thread for full discussion):

Any suggestion for the migration plan for users of ctx.resolve_command? This returns the command as a list of strings

bazel/src/main/java/com/google/devtools/build/lib/analysis/starlark/StarlarkRuleContext.java

Line 982 in 0d05fcc

List<String> argv = helper.buildCommandLine(command, inputs, constructor);

which we were just passing through to command here: /~https://github.com/bazelbuild/apple_support/blob/2583fa0bfd6909e7936da5b30e3547ba13e198dc/rules/apple_genrule.bzl#L83

I'm filing a separate bug to make sure the issue is visible and properly triaged.

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