Roll Flutter Engine from 387f6f3c5fdb to ef820aa74f7a (4 revisions) (f…

…lutter#153124)

flutter/engine@387f6f3...ef820aa

2024-08-08 [email protected] [Impeller] perform final blit and gpu end frame tracing earlier. (flutter/engine#54452)
2024-08-08 [email protected] Add EGL Surface backing store (flutter/engine#43683)
2024-08-08 [email protected] Fix include of GrVkImageInfo header for the Fuchsia build (flutter/engine#54449)
2024-08-08 [email protected] Roll Fuchsia Test Scripts from AYS3tfC91ZRfdmIL0... to TXbf0oL9XzQ8vcHJP... (flutter/engine#54448)

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bin/internal/engine.version

@@ -1 +1 @@
-387f6f3c5fdba18f547e2d403169286702e18867
+ef820aa74f7a47bb35e7fc3ed322a9599f71cadf