System.Resources.ResourceManager.Tests fails on iOS/tvOS

[mdh1418]

System.Resources.ResourceManager.Tests
System.Resources.Tests.ResourceManagerTests.GetString_CultureFallback
System.Resources.Tests.ResourceManagerTests.GetString_FromTestClassWithoutNeutralResources

System.Resources.ResourceManager.Tests.dll   Failed: 6

Test collection for System.Resources.Tests.ResourceManagerTests
System.Resources.Tests.ResourceManagerTests.GetString_CultureFallback(key: \"Lang\", cultureName: \"es-MX\", expectedValue: \"es\")
    Assert.Equal() Failure\nExpected: es\nActual:   (null)
System.Resources.Tests.ResourceManagerTests.GetString_CultureFallback(key: \"OneLoc\", cultureName: \"es\", expectedValue: \"Value-One(es)\")
    Assert.Equal() Failure\n                   ↓ (pos 9)\nExpected: Value-One(es)\nActual:   Value-One\n                   ↑ (pos 9)
System.Resources.Tests.ResourceManagerTests.GetString_CultureFallback(key: \"OneLoc\", cultureName: \"fr-FR\", expectedValue: \"Value-One(fr-FR)\")
    Assert.Equal() Failure\n                   ↓ (pos 9)\nExpected: Value-One(fr-FR)\nActual:   Value-One\n                   ↑ (pos 9)
System.Resources.Tests.ResourceManagerTests.GetString_CultureFallback(key: \"OneLoc\", cultureName: \"es-ES\", expectedValue: \"Value-One(es)\")
    Assert.Equal() Failure\n                   ↓ (pos 9)\nExpected: Value-One(es)\nActual:   Value-One\n                   ↑ (pos 9)
System.Resources.Tests.ResourceManagerTests.GetString_CultureFallback(key: \"OneLoc\", cultureName: \"es-MX\", expectedValue: \"Value-One(es-MX)\")
    Assert.Equal() Failure\n                   ↓ (pos 9)\nExpected: Value-One(es-MX)\nActual:   Value-One\n                   ↑ (pos 9)
System.Resources.Tests.ResourceManagerTests.GetString_FromTestClassWithoutNeutralResources
    System.Resources.MissingManifestResourceException : Could not find the resource \"System.Resources.Tests.Resources.TestClassWithoutNeutralResources.resources\" among the resources \"System.Resources.Tests.Resources.TestResx.resources\", \"System.Resources.Tests.Resources.CustomReader.resources\", \"System.Resources.Tests.Resources.TestResx.netstandard17.resources\" embedded in the assembly \"System.Resources.ResourceManager.Tests\", nor among the resources in any satellite assemblies for the specified culture. Perhaps the resources were embedded with an incorrect name.

Tagging subscribers to this area: @tarekgh, @buyaa-n, @krwq
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[tarekgh]

CC @safern

[steveisok]

@mdh1418 These tests no longer fail and can be re-enabled.