Format code action (and the rego v1 formatting action) should report errors from formatting

[anderseknert]

package p

allow {
    re_match("foo", "bar")
}

Formatting this for Rego v1 using the command line:

opa fmt --rego-v1 -w policy
failed to format Rego source file: 1 error occurred: p.rego:4: rego_type_error: deprecated built-in function calls in expression: re_match

However, when trying to do this via LSP code actions, no error is reported back and the file is simply left unchanged.

I assume the same goes for the "normal" (non-v1) formatter too, but it might be tricky to have it produce errors that aren't parse errors.