[parser] Add F# pipeline operator tests

src/parser/test/flow/fsharp_pipeline_operator/arrow-and-array-in-body-with-operator.js

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+x => x |> [y => y + 1 |> z => z * 2]

src/parser/test/flow/fsharp_pipeline_operator/arrow-and-array-in-body.js

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+x => x |> [y => y + 1] |> z => z * 2

src/parser/test/flow/fsharp_pipeline_operator/arrow-and-assignment-in-body.js

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+x => x |> foo(x = 1 |> foo);

src/parser/test/flow/fsharp_pipeline_operator/arrow-and-object-in-body-with-operator.js

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+x => x |> { method: y => y + 1 |> z => z * 2 }

src/parser/test/flow/fsharp_pipeline_operator/arrow-and-object-in-body.js

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+x => x |> { method: y => y + 1 } |> z => z * 2

src/parser/test/flow/fsharp_pipeline_operator/arrow-at-head-indented.js

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+x => x |> inc |> double

src/parser/test/flow/fsharp_pipeline_operator/arrow-at-head.js

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+x => x |> inc |> double

src/parser/test/flow/fsharp_pipeline_operator/arrow-in-body-alt-parens.js

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+x => x |> (y => y + 3 |> (b => y + b))

src/parser/test/flow/fsharp_pipeline_operator/arrow-in-body-no-parens-indented-with-arg-parens.js

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+(x) => x
+  |> (y) => y + 1
+  |> (z) => z * 2

src/parser/test/flow/fsharp_pipeline_operator/arrow-in-body-no-parens-indented.js

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+x => x
+  |> y => y + 1
+  |> z => z * 2;

src/parser/test/flow/fsharp_pipeline_operator/arrow-in-body-no-parens-with-arg-parens.js

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+(x) => x |> (y) => y + 1 |> (z) => z * 2;

src/parser/test/flow/fsharp_pipeline_operator/arrow-in-body-no-parens.js

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+x => x |> y => y + 1 |> z => z * 2;

src/parser/test/flow/fsharp_pipeline_operator/await-end.js

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+async function test () {
+  return x |> await;
+}

src/parser/test/flow/fsharp_pipeline_operator/await.js

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+async function test () {
+  return x |> await |> f;
+}

src/parser/test/flow/fsharp_pipeline_operator/ban-await-f.js

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+async function test () {
+  return x |> await f;
+}

src/parser/test/flow/fsharp_pipeline_operator/base.js

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+a |> b

src/parser/test/flow/fsharp_pipeline_operator/chain.js

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+x |> inc |> double