Fix AoT warnings (and update to Abstractions 9.1.0)#3366

jmprieur merged 3 commits intomasterAzureAD/microsoft-identity-web:masterfrom

jmprieur/removeAotWarningsInDownstreamApisAndNonBreakingChangesOnesAzureAD/microsoft-identity-web:jmprieur/removeAotWarningsInDownstreamApisAndNonBreakingChangesOnesCopy head branch name to clipboard