refactor: update js_binary executable path to {name}_/{name}

[gregmagolan]

Follow-up to #1586.

The trouble with the change in #1586 with the name of the executable in the output tree the same as the target name is that a target name such as test could be in a BUILD file where a subdirectory named test exists which can lead to build failures such as:

ERROR: One of the output paths 'bazel-out/k8-fastbuild/bin/foo/test' (belonging to //foo:test) and 'bazel-out/k8-fastbuild/bin/foo/test/active_file_users_test.ts' (belonging to //foo:foo) is a prefix of the other. These actions cannot be simultaneously present; please rename one of the output files or build just one of them

This change resolves that issue without bringing back the .sh suffix that #1586 was addressing.

NB: the {name}_/{name} naming scheme was copied from rules_go, which uses the same scheme for go_binary,

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Test

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e2e/npm_translate_lock_subdir_patch

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e2e/npm_translate_package_lock

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Buildifier      Format

[jbedard]

Was this convention copied from somewhere?

[gregmagolan]

Was this convention copied from somewhere?

Copied from rules_go