28144 fuchsia: Add FuchsiaExternalViewEmbedder tests (affects: tests, cla: yes, platform-fuchsia, tech-debt)

28145 Roll Skia from 957ed75731e0 to 7020699e3835 (7 revisions) (cla: yes, waiting for tree to go green)

28146 Fix Libtxt unit test errors found by ASAN (cla: yes, waiting for tree to go green)

28147 Fix some stack-use-after-scopes found by ASan (cla: yes, embedder)

28148 Roll Skia from 7020699e3835 to fdcf153f6caa (3 revisions) (cla: yes, waiting for tree to go green)