Use fuchsia.scheduler.RoleManager protocol (#54587)

As of f20, fuchsia.scheduler.RoleManager is preferred over fuchsia.media.ProfileProvider. The Vulkan ICD uses fuchsia.scheduler.RoleManager and is loaded into the flutter component, so the component needs to use the fuchsia.scheduler.RoleManager protocol.

*List which issues are fixed by this PR. You must list at least one issue.*
Fixes flutter/flutter#153591

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style

Author: John Bauman

shell/platform/fuchsia/flutter/meta/common.shard.cml

@@ -38,6 +38,7 @@
                 "fuchsia.logger.LogSink", // Copied from syslog/client.shard.cml.
                 "fuchsia.media.ProfileProvider",
                 "fuchsia.memorypressure.Provider",
+                "fuchsia.scheduler.RoleManager",
                 "fuchsia.net.name.Lookup",
                 "fuchsia.posix.socket.Provider",
                 "fuchsia.sysmem.Allocator",