refactor: move Wasm test files to tests/all/cli_tests

Previously the inputs to `tests/all/cli_tests.rs` were contained in
`tests/wasm`. This change moves them to the more obvious
`tests/all/cli_tests` directory and updates the paths that point to
them.

tests/all/cli_tests/hello_wasi_snapshot0.wat

@@ -0,0 +1,25 @@
+(module
+  (import "wasi_unstable" "proc_exit"
+    (func $__wasi_proc_exit (param i32)))
+  (import "wasi_unstable" "fd_write"
+    (func $__wasi_fd_write (param i32 i32 i32 i32) (result i32)))
+  (func $_start
+    (i32.store (i32.const 24) (i32.const 14))
+    (i32.store (i32.const 20) (i32.const 0))
+    (block
+      (br_if 0
+        (call $__wasi_fd_write
+          (i32.const 1)
+          (i32.const 20)
+          (i32.const 1)
+          (i32.const 16)))
+      (br_if 0 (i32.ne (i32.load (i32.const 16)) (i32.const 14)))
+      (br 1)
+    )
+    (call $__wasi_proc_exit (i32.const 1))
+  )
+  (memory 1)
+  (export "memory" (memory 0))
+  (export "_start" (func $_start))
+  (data (i32.const 0) "Hello, world!\0a")
+)