refactor: use BASH_RLOCATION_FUNCTION from @aspect_bazel_lib in examples/js_binary/BUILD.bazel

[gregmagolan]

Pre-factor from #1690..

No reason to inline the # --- begin runfiles.bash initialization v2 --- when we can use the exported version from @aspect_bazel_lib.

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Buildifier      Format

[jbedard]

Can this go into 1.x?

[gregmagolan]

Can this go into 1.x?

Was going to say no because this depends on expand_template out of a newer bazel-lib... but looks like main is depending on a minimum bazel lib 1.42.3 which has expand_template already. I'll point it there instead.