Backport gzip I/O retry logic and redirected-input console guard to release/10.0.4xx

[Copilot]

Two transient-failure paths from main (#53424) were missing from the servicing branch.

Changes

• GZipCompress.cs — replaces bare try/catch with a bounded retry loop (3 attempts, 200ms × attempt backoff) that retries only IOException, covering transient file locks from antivirus/indexers on CI machines:

  catch (IOException) when (attempt < MaxRetries)
  {
      Log.LogMessage(MessageImportance.Low,
          "Retrying compression of '{0}' (attempt {1}/{2}) due to transient I/O error.",
          file.ItemSpec, attempt, MaxRetries);
      Thread.Sleep(RetryDelayMs * attempt);
  }

• PhysicalConsole.cs — gates ListenToConsoleKeyPressAsync() behind !Console.IsInputRedirected, preventing Console.ReadKey from blocking/throwing in redirected-stdin environments:

  if (testFlags.HasFlag(TestFlags.ReadKeyFromStdin))
      _ = ListenToStandardInputAsync();
  else if (!Console.IsInputRedirected)
      _ = ListenToConsoleKeyPressAsync();

[marcpopMSFT]

@MichaelSimons per #54277, I asked copilot which changes from Matt's test stability PR to backport and it chose these two. 4xx doesn't require tactics so should be reasonable to backport. We'd have to consider risk more closely for a 1xx backport.

[Copilot]

Pull request overview

Backports two reliability fixes from main into release/10.0.4xx: (1) bounded retry logic around gzip compression to reduce transient CI flakiness, and (2) avoiding Console.ReadKey in redirected-stdin scenarios to prevent hangs/exceptions.

Changes:

• Add bounded IOException retry loop with backoff to GZipCompress compression work.
• Gate ListenToConsoleKeyPressAsync() behind !Console.IsInputRedirected in PhysicalConsole.
• (Unrelated) Modify Microsoft.CodeAnalysis.NetAnalyzers.sarif formatting/encoding.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/Microsoft.CodeAnalysis.NetAnalyzers/src/Microsoft.CodeAnalysis.NetAnalyzers.sarif	Unrelated formatting/encoding-only change; likely should be excluded from this backport.
src/Dotnet.Watch/Watch/UI/PhysicalConsole.cs	Avoids Console.ReadKey when stdin is redirected, but currently also drops Ctrl+C handling in that scenario.
src/BlazorWasmSdk/Tasks/GZipCompress.cs	Adds bounded retry/backoff around gzip I/O to mitigate transient IOException flakiness.