Roll Flutter Engine from 700250436e3f to efc69946cb1e (2 revisions) (#143816)

https://github.com/flutter/engine/compare/700250436e3f...efc69946cb1e

2024-02-21 zanderso@users.noreply.github.com Make global builds uniquely named per platform (flutter/engine#50764)
2024-02-21 zanderso@users.noreply.github.com [et] Adds a format command (flutter/engine#50747)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC jimgraham@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

bin/internal/engine.version

-700250436e3fe4de718604f3bc3213e09e1962e0
+efc69946cb1e463b47802617456fe5cedaf7c296