[Android] Re-enable Android emulator tests in dotnet-runtime pipeline

[kotlarmilos]

Description

Once the capacity issue is resolved dotnet/dnceng#5909, re-enable Android emulator tests in dotnet-runtime.

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Tagging subscribers to 'arch-android': @vitek-karas, @simonrozsival, @steveisok, @akoeplinger
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[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/runtime-infrastructure
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