Adjust for RefreshInterval not influencing AutomaticRefreshInterval.

[brentschmaltz]

Removed last instance of RefreshInterval influencing AutomaticRefreshInterval.

Remove dead code in ConfigurationManager.
There was code inside a null check that would not get executed, it was removed.

[pmaytak]

The test is failing

  Failed Microsoft.IdentityModel.Protocols.OpenIdConnect.Tests.ConfigurationManagerTests.BootstrapRefreshIntervalTest [16 ms]
  Error Message:
   Microsoft.IdentityModel.TestUtils.TestException : Microsoft.IdentityModel.Protocols.OpenIdConnect.Tests.ConfigurationManagerTests.BootstrapRefreshIntervalTest

ConfigurationManager._syncAfter: '10/4/2024 9:15:42 AM +00:00' should equal '1/1/0001 12:00:00 AM +00:00'.

  Stack Trace:
     at Microsoft.IdentityModel.TestUtils.TestUtilities.AssertFailIfErrors(String testId, List`1 errors) in D:\a\_work\1\s\test\Microsoft.IdentityModel.TestUtils\TestUtilities.cs:line 371
   at Microsoft.IdentityModel.TestUtils.TestUtilities.AssertFailIfErrors(CompareContext context) in D:\a\_work\1\s\test\Microsoft.IdentityModel.TestUtils\TestUtilities.cs:line 352
   at Microsoft.IdentityModel.Protocols.OpenIdConnect.Tests.ConfigurationManagerTests.<BootstrapRefreshIntervalTest>d__7.MoveNext() in D:\a\_work\1\s\test\Microsoft.IdentityModel.Protocols.OpenIdConnect.Tests\ConfigurationManagerTests.cs:line 262
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)