[Bug] Investigate and revert HTTP 2 changes

[bgavrilMS]

Library version used

4.74.1

.NET version

See https://portal.microsofticm.com/imp/v5/incidents/details/680651288/summary for details. The only change made between the reported versions that is related to HTTP is https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/pull/5314/files

I think we should revert it?

Scenario

ConfidentialClient - web api (AcquireTokenOnBehalfOf)

Is this a new or an existing app?

None

Issue description and reproduction steps

HTTP timeouts

Relevant code snippets

Expected behavior

No response

Identity provider

Microsoft Entra ID (Work and School accounts and Personal Microsoft accounts)

Regression

No response

Solution and workarounds

No response