fix: httpclient error on macos ci and lint.yml errors

[filzrev]

From Mar 4, XRefArchiveBuilderTest.TestDownload test is continuously failed on macos-latest.

And following exception is internally thrown.

Failed Docfx.Build.Engine.Tests.XRefArchiveBuilderTest.TestDownload [381 ms]
  Error Message:
   System.Net.Http.HttpRequestException : The SSL connection could not be established, see inner exception.
---- System.Security.Authentication.AuthenticationException : The remote certificate is invalid because of errors in the certificate chain: RevocationStatusUnknown
  Stack Trace:
     at System.Net.Http.ConnectHelper.EstablishSslConnectionAsync(SslClientAuthenticationOptions sslOptions, HttpRequestMessage request, Boolean async, Stream stream, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.InjectNewHttp11ConnectionAsync(QueueItem queueItem)
   at System.Threading.Tasks.TaskCompletionSourceWithCancellation`1.WaitWithCancellationAsync(CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithVersionDetectionAndRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.DecompressionHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.SocketsHttpHandler.<SendAsync>g__CreateHandlerAndSendAsync|115_0(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.GetStreamAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken)
   at Docfx.Build.Engine.XRefMapDownloader.DownloadFromWebAsync(Uri uri, CancellationToken token) in /_/src/Docfx.Build/XRefMaps/XRefMapDownloader.cs:line 166
   at Docfx.Build.Engine.XRefMapDownloader.DownloadBySchemeAsync(Uri uri, CancellationToken token) in /_/src/Docfx.Build/XRefMaps/XRefMapDownloader.cs:line 93
   at Docfx.Build.Engine.XRefMapDownloader.<>c__DisplayClass3_0.<<DownloadAsync>b__0>d.MoveNext() in /_/src/Docfx.Build/XRefMaps/XRefMapDownloader.cs:line 53
--- End of stack trace from previous location ---
   at Docfx.Build.Engine.XRefMapDownloader.DownloadAsync(Uri uri, CancellationToken token) in /_/src/Docfx.Build/XRefMaps/XRefMapDownloader.cs:line 47
   at Docfx.Build.Engine.XRefArchiveBuilder.DownloadCoreAsync(Uri uri, XRefArchive xa, CancellationToken cancellationToken) in /_/src/Docfx.Build/XRefMaps/XRefArchiveBuilder.cs:line 41
   at Docfx.Build.Engine.XRefArchiveBuilder.DownloadAsync(Uri uri, String outputFile, CancellationToken cancellationToken) in /_/src/Docfx.Build/XRefMaps/XRefArchiveBuilder.cs:line 27
   at Docfx.Build.Engine.Tests.XRefArchiveBuilderTest.TestDownload() in /_/test/Docfx.Build.Tests/XRefArchiveBuilderTest.cs:line 23
--- End of stack trace from previous location ---
----- Inner Stack Trace -----
   at System.Net.Security.SslStream.SendAuthResetSignal(ReadOnlySpan`1 alert, ExceptionDispatchInfo exception)
   at System.Net.Security.SslStream.CompleteHandshake(SslAuthenticationOptions sslAuthenticationOptions)
   at System.Net.Security.SslStream.ForceAuthenticationAsync[TIOAdapter](Boolean receiveFirst, Byte[] reAuthenticationData, CancellationToken cancellationToken)
   at System.Net.Http.ConnectHelper.EstablishSslConnectionAsync(SslClientAuthenticationOptions sslOptions, HttpRequestMessage request, Boolean async, Stream stream, CancellationToken cancellationToken)

As far as I've confirmed.
Server certificate of https://dotnet.github.io has no issues.
But it seems failed to access OCSP endpoint with HTTP protocol and cause RevocationStatusUnknown error.

This PR add logics to skip RevocationStatusUnknown errors on macos
(On Windows/Linux environment, OSCP endpoint seems not used)