When using the kind `gazelle:map_kind` directive, `gazelle` will
correctly generate the buildfile on the first pass (or if no target of
that type / name are present).

However, when running gazelle a second time (or if a target of the
mapped kind with the same name is present), `gazelle` will error out
saying that it kind create a target of the original kind because a
target of mapped kind is present and has the same name.

Ex:
Given the directive `# gazelle:map_kind py_test py_pytest_test
//src/bazel/rules/python:py_pytest_test.bzl`, `gazelle` will correctly
generate a `py_pytest_test` target where it would have generated a
`py_test` target.

But on a second invocation of `gazelle` (and subsequent invocations) it
will error our with:
```
gazelle: ERROR: failed to generate target "//test/python/common:common_test" of kind "py_test": a target of kind "py_pytest_test" with the same name already exists. Use the '# gazelle:python_test_naming_convention' directive to change the naming convention.
```