Set go_naming_convention for cel-go

[riking]

What type of PR is this?

Set the go_naming_convention for github.com/google/cel-go

What package or component does this PR mostly affect?

default_gazelle_overrides

What does this PR do? Why is it needed?

I'm not sure why this isn't being auto detected, but I needed to add the override directive for Gazelle to write the imports correctly.

Which issues(s) does this PR fix?

Fixes # (not filed)

Other notes for review

I am applying a patch to the repo to change a package visibility, which could be causing the auto detect failure:

go_deps.module_override(
    path = "github.com/google/cel-go",
    patch_strip = 1,
    patches = [
        "//:build/0001-cel-go-Change-visibility-of-ast-to-public.patch",
    ],
)
go_deps.gazelle_override(
    directives = [
        "gazelle:go_naming_convention go_default_library",
    ],
    path = "github.com/google/cel-go",
)