Fix compiling core/profiling files with Perfetto profiler

[Mister-Ky]

Refined #118856

I didn't look in any other places for the operator String(), I only came across it myself in core/profiling.

• Bugsquad edit: Includes [Android] Fix broken build with Perfetto profiler #120668

[Ivorforce]

Oh, dang, I really should have caught those. Thanks!

[akien-mga]

@Ivorforce Do those need converting too?

platform/web/javascript_bridge_singleton.cpp
230:                    CharString *cs = memnew(CharString(v->operator String().utf8()));

drivers/vulkan/rendering_context_driver_vulkan.cpp
700:    CharString cs = GLOBAL_GET("application/config/name").operator String().utf8();

core/io/plist.cpp
115:                    node->data_string = p_value.operator String().utf8();

[AThousandShips]

Those are all Variant so not sure if it applies to them

[Repiteo]

Thanks!