HTTP test null refs in 'Build Browser wasm Release AllSubsets_Mono_EAT' CI leg

[stephentoub]

[13:10:13] fail: [FAIL] System.Net.Http.Tests.HttpHeadersTest.NonValidated_ValidAndInvalidValues_DictionaryMembersWork
[13:10:13] info: System.NullReferenceException : Object reference not set to an instance of an object.
[13:10:13] info:    at System.Net.Http.Tests.HttpHeadersTest.NonValidated_ValidAndInvalidValues_DictionaryMembersWork()
[13:10:13] info:    at System.Reflection.RuntimeMethodInfo.Invoke(Object , BindingFlags , Binder , Object[] , CultureInfo )
[13:10:13] fail: console.error: /__w/1/s/src/mono/mono/utils/memfuncs.c:360 <disabled>

It doesn't repro in any of the other legs. From @lewing: "Ah, so the EAT leg aggressively trims the test itself so this is almost certainly trimming related."

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Issue Details

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[13:10:13] fail: [FAIL] System.Net.Http.Tests.HttpHeadersTest.NonValidated_ValidAndInvalidValues_DictionaryMembersWork
[13:10:13] info: System.NullReferenceException : Object reference not set to an instance of an object.
[13:10:13] info:    at System.Net.Http.Tests.HttpHeadersTest.NonValidated_ValidAndInvalidValues_DictionaryMembersWork()
[13:10:13] info:    at System.Reflection.RuntimeMethodInfo.Invoke(Object , BindingFlags , Binder , Object[] , CultureInfo )
[13:10:13] fail: console.error: /__w/1/s/src/mono/mono/utils/memfuncs.c:360 <disabled>

It doesn't repro in any of the other legs. From @lewing: "Ah, so the EAT leg aggressively trims the test itself so this is almost certainly trimming related."

Author:	stephentoub
Assignees:	-
Labels:	arch-wasm, area-System.Net.Http, disabled-test
Milestone:	6.0.0

[MaximLipnin]

Same for Android AOT lane with EAT in #50510

[lewing]

cc @SamMonoRT

[fanyang-mono]

Test passed when running locally with trimming.