System.Net.Requests.Tests tests fail on Android

[mdh1418]

Several tests from System.Net.Requests.Tests fail on Android

System.Net.Requests.Tests

• System.Net.Tests.HttpWebRequestTest_Sync.SimpleScenario_UseGETVerb_Success(useSsl: True)
• System.Net.Tests.HttpWebRequestTest_Sync.GetResponseAsync_UseDefaultCredentials_ExpectSuccess(useSsl: True)
• System.Net.Tests.HttpWebRequestTest_Sync.GetResponseAsync_PostRequestStream_ContainsData(useSsl: True)
• System.Net.Tests.HttpWebRequestTest_Sync.ResponseUri_GetResponseAsync_ExpectSameUri(useSsl: True)
• System.Net.Tests.HttpWebRequestTest_Sync.Headers_GetResponseHeaders_ContainsExpectedValue(useSsl: True)
• System.Net.Tests.HttpWebRequestTest_Sync.HaveResponse_GetResponseAsync_ExpectTrue(useSsl: True)
• System.Net.Tests.HttpWebRequestTest_Sync.ContentType_AddHeaderWithNoContent_SendRequest_HeaderGetsSent(useSsl: True)
• System.Net.Tests.HttpWebRequestTest_Sync.GetResponseAsync_GetResponseStream_ContainsHost(useSsl: True)
• System.Net.Tests.HttpWebRequestTest_Sync.SimpleScenario_UsePOSTVerb_Success(useSsl: True)
• System.Net.Tests.HttpWebRequestTest_Sync.ContentLength_Get_ExpectSameAsGetResponseStream(useSsl: True)
• System.Net.Tests.SyncFileWebRequestTestBase.RequestAfterResponse_throws
• System.Net.Tests.SyncFileWebRequestTestBase.WriteThenReadFile_WriteAccessResultsInNullResponseStream
• System.Net.Tests.SyncFileWebRequestTestBase.ReadFile_ContainsExpectedContent
• System.Net.Tests.SyncFileWebRequestTestBase.WriteFile_ContainsExpectedContent
• System.Net.Tests.HttpWebRequestTest_Async.GetResponseAsync_PostRequestStream_ContainsData(useSsl: True)
• System.Net.Tests.HttpWebRequestTest_Async.HaveResponse_GetResponseAsync_ExpectTrue(useSsl: True)
• System.Net.Tests.HttpWebRequestTest_Async.ResponseUri_GetResponseAsync_ExpectSameUri(useSsl: True)
• System.Net.Tests.HttpWebRequestTest_Async.GetResponseAsync_UseDefaultCredentials_ExpectSuccess(useSsl: True)
• System.Net.Tests.HttpWebRequestTest_Async.GetResponseAsync_GetResponseStream_ContainsHost(useSsl: True)
• System.Net.Tests.HttpWebRequestTest_Async.SimpleScenario_UseGETVerb_Success(useSsl: True)
• System.Net.Tests.HttpWebRequestTest_Async.Headers_GetResponseHeaders_ContainsExpectedValue(useSsl: True)
• System.Net.Tests.HttpWebRequestTest_Async.ContentType_AddHeaderWithNoContent_SendRequest_HeaderGetsSent(useSsl: True)
• System.Net.Tests.HttpWebRequestTest_Async.ContentLength_Get_ExpectSameAsGetResponseStream(useSsl: True)
• System.Net.Tests.HttpWebRequestTest_Async.SimpleScenario_UsePOSTVerb_Success(useSsl: True)
• System.Net.Tests.LoggingTest.EventSource_ExistsWithCorrectId
• System.Net.Tests.HttpWebRequestTest_Async.HttpWebRequest_Serialize_Fails
• System.Net.Tests.HttpWebResponseHeaderTest.HttpWebResponse_Serialize_ExpectedResult
• System.Net.Tests.HttpWebRequestTest_Sync.HttpWebRequest_Serialize_Fails

Edit: Updated based on #50095

Tagging subscribers to this area: @dotnet/ncl
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[simonrozsival]

Judging by (useSsl: True) being part of most of the failing tests and no False counterparts failing, this could be the same problem with self-signed certificates on Android as I'm trying to fix with #71385