Remove "js" language from thrift_library targets

Summary:
The thrift JS codegen via thrift_library Buck targets is unused — no
target actually depends on any of the generated -js outputs. Remove "js"
from all languages lists and thrift_js_options from all thrift_library
rules outside of fbcode/thrift and xplat/thrift.

Also removes the dead js_executable sample in proxygen/websocketserver
and the -js deps in scripts/pranavtbhat/jsinterop.

Reviewed By: iahs, vitaut

Differential Revision: D95781669

fbshipit-source-id: 72d5a8b8ad7d27d186ff54cbe481182dc59da11a

Author: lexs

fb303/thrift/BUCK

@@ -31,7 +31,6 @@ thrift_library(
         "python",
         "go",
         "hs2",
-        "js",
         "py-deprecated-asyncio",
         "rust",
         "erlang",
@@ -48,7 +47,6 @@ thrift_library(
     py_base_module = "",
     thrift_cpp2_options = "frozen2,reflection",
     thrift_java_swift_options = ["deprecated_allow_leagcy_reflection_client"],
-    thrift_js_options = ["node"],
     thrift_rust_options = [
         "deprecated_default_enum_min_i32",
         "serde",