[fuchsia] Ask for VMEX only for JIT.

[rmacnak-google]

Bug: b/501539846

[gemini-code-assist]

Code Review

This pull request relocates the fuchsia.kernel.VmexResource protocol from common shards to JIT-specific runner manifests for both Dart and Flutter. Review feedback suggests that removing this capability from the common shards may cause regressions in AOT mode, specifically breaking FFI callback functionality which relies on VMEX for thunks.

[flutter-dashboard]

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[auto-submit]

autosubmit label was removed for flutter/flutter/185440, because - The status or check suite Mac mac_unopt has failed. Please fix the issues identified (or deflake) before re-applying this label.