[ Tool ] Ignore invalid UTF-8 from ADB's stdout

[bkonyi]

This was incorrectly updated as part of #177470

[flutter-dashboard]

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[gemini-code-assist]

Code Review

This pull request corrects an issue in AdbLogReader where invalid UTF-8 characters from adb's stdout could cause a crash. The change aligns the stdout stream processing with that of the stderr stream by applying a Utf8Decoder configured to ignore errors. This is a good fix that improves the robustness of log parsing and prevents potential crashes from malformed logcat output.

[reidbaker]

Non blocking: is it possible to add a regression test for this case?

[bkonyi]

Non blocking: is it possible to add a regression test for this case?

It doesn't look like it'll be trivial without some refactoring of our FakeProcessManager and related classes.