"flutter test" command should not require libGL dependency

[yyoon]

flutter test command uses sky_shell to execute the tests in non-interactive mode.
However, because sky_shell also supports interactive mode, it requires the libGL libraries such as libGL.so.1.

This is causing us issues with running flutter tests on LUCI build bots, because the builder machines does not have libGL libraries installed.

Ideally, flutter test should use a version of sky_shell without the libGL dependency.

cc/ @chinmaygarde

[eseidelGoogle]

@chinmaygarde is on this now. :) Thanks!

[chinmaygarde]

Update: We have removed the dependency on GL, FontConfig and a few other libraries from the test shell. However, Skia seems to be linking it in all the same. I will need to patch that and do a roll.

[github-actions]

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