Fix all remaining wasm64 test failures

We currently run the entire core test suite in wasm64 and wasm64_4gb modes but there are some tests are are disabled for various reasons:

- [ ] ASAN is not supported
- [ ] wasm2js is not supported
- [x] Emscripten setjmp/longjmp is not yet supported

For browser tests we currently disabled certain tests under wasm64:

- [x] LEGACY_GL_EMULATION is not supported
- [x] BUILD_AS_WORKER is not supported
- [x] Fetch support
- [x] SDL2 is not supported
- [ ] Fix remaining SDL2 issue (https://github.com/libsdl-org/SDL/issues/9052)

We also only run a very small subset of tests in browser64_4gb mode. We should remove this restriction and run all of them.