Fix tests that depend on UTF8ToString(). (#24960)

E.g. `wasmfs` test mode pulls in less JS code, so don't get to
implicitly/automatically get in `UTF8ToString()`.

Author: juj

test/core/test_dyncall_pointers.c

@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <emscripten/em_js.h>
 
-EM_JS_DEPS(deps, "$dynCall");
+EM_JS_DEPS(deps, "$UTF8ToString,$dynCall");
 
 EM_JS(void, testDynCall, (void* ptr, const char* str), {
   let rtn = dynCall("pipp", Number(ptr), [42, 43, Number(str)]);

test/core/test_em_asm.cpp

@@ -6,6 +6,8 @@
 #include <emscripten.h>
 #include <stdio.h>
 
+EM_JS_DEPS(deps, "$UTF8ToString");
+
 int main() {
   printf("BEGIN\n");
   EM_ASM({ out("no args works"); });

test/core/test_em_asm_2.cpp

@@ -6,6 +6,8 @@
 #include <emscripten.h>
 #include <stdio.h>
 
+EM_JS_DEPS(deps, "$UTF8ToString");
+
 int main() {
   printf("EM_ASM: Simple expression without trailing semicolon\n");
   EM_ASM(out('1. expression without trailing semicolon'));

test/core/test_em_js.cpp

@@ -63,7 +63,7 @@ EM_JS(int, user_comma, (void), {
   return x[y][1];
 });
 
-EM_JS_DEPS(deps, "$stringToUTF8,$lengthBytesUTF8");
+EM_JS_DEPS(deps, "$UTF8ToString,$stringToUTF8,$lengthBytesUTF8");
 
 EM_JS(char*, return_utf8_str, (void), {
     var jsString = 'こんにちは';

test/core/test_utf.c

@@ -11,7 +11,7 @@
 #include <emscripten/emscripten.h>
 #include <emscripten/em_js.h>
 
-EM_JS_DEPS(deps, "$stringToUTF8OnStack,$getValue");
+EM_JS_DEPS(deps, "$UTF8ToString,$stringToUTF8OnStack,$getValue");
 
 int main() {
   char *c = "μ†ℱ ╋ℯ╳╋ 😇";