chore: move cli/tests/ -> tests/ (#22369)

This looks like a massive PR, but it's only a move from cli/tests ->
tests, and updates of relative paths for files.

This is the first step towards aggregate all of the integration test
files under tests/, which will lead to a set of integration tests that
can run without the CLI binary being built.

While we could leave these tests under `cli`, it would require us to
keep a more complex directory structure for the various test runners. In
addition, we have a lot of complexity to ignore various test files in
the `cli` project itself (cargo publish exclusion rules, autotests =
false, etc).

And finally, the `tests/` folder will eventually house the `test_ffi`,
`test_napi` and other testing code, reducing the size of the root repo
directory.

For easier review, the extremely large and noisy "move" is in the first
commit (with no changes -- just a move), while the remainder of the
changes to actual files is in the second commit.

tests/unit_node/_fs/_fs_fdatasync_test.ts

@@ -0,0 +1,58 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+import { assertEquals, fail } from "@test_util/std/assert/mod.ts";
+import { fdatasync, fdatasyncSync } from "node:fs";
+
+Deno.test({
+  name:
+    "ASYNC: flush any pending data operations of the given file stream to disk",
+  async fn() {
+    const filePath = await Deno.makeTempFile();
+    using file = await Deno.open(filePath, {
+      read: true,
+      write: true,
+      create: true,
+    });
+    const data = new Uint8Array(64);
+    await file.write(data);
+
+    await new Promise<void>((resolve, reject) => {
+      fdatasync(file.rid, (err: Error | null) => {
+        if (err !== null) reject();
+        else resolve();
+      });
+    })
+      .then(
+        async () => {
+          assertEquals(await Deno.readFile(filePath), data);
+        },
+        () => {
+          fail("No error expected");
+        },
+      )
+      .finally(async () => {
+        await Deno.remove(filePath);
+      });
+  },
+});
+
+Deno.test({
+  name:
+    "SYNC: flush any pending data operations of the given file stream to disk.",
+  fn() {
+    const filePath = Deno.makeTempFileSync();
+    using file = Deno.openSync(filePath, {
+      read: true,
+      write: true,
+      create: true,
+    });
+    const data = new Uint8Array(64);
+    Deno.writeSync(file.rid, data);
+
+    try {
+      fdatasyncSync(file.rid);
+      assertEquals(Deno.readFileSync(filePath), data);
+    } finally {
+      Deno.removeSync(filePath);
+    }
+  },
+});