Announce when the tool is waiting for interactive input

[ramonsmits]

Problem

The tool blocks on Console.ReadLine / Console.ReadKey at three interactive points:

• the customer name prompt (BaseCommand), when --customerName isn't supplied;
• the "Do you wish to proceed?" confirmation (Out.Confirm), when --unattended isn't supplied;
• HTTP/RabbitMQ credentials (InteractiveHttpAuth).

On a seemingly-frozen console this is easily mistaken for a hang. The customer-name prompt is the first interactive point after the version check, so a run that's simply waiting for a name looks identical to one that's stuck. This came up in support case 00106424, where the console output ended right at that prompt and the tool was reported as "hanging indefinitely".

Change

Add Out.WriteAwaitingInput(string message) — a highlighted (cyan) notice printed immediately before each blocking prompt — and call it at the three sites above. The customer-name message also points at the flags that avoid the prompt in automated/locked-down environments (--customerName, --unattended).

No behavior change beyond the extra notice; prompts and reads are unchanged.

Before / after (customer-name prompt)

Before — silent after the version line, then blocks:

Particular.EndpointThroughputCounter 1.34.0 (Sha:...)
Skipping current version check. Please ensure you are not using an outdated version.

Enter customer name:

After:

Particular.EndpointThroughputCounter 1.34.1-... (Sha:...)
Skipping current version check. Please ensure you are not using an outdated version.

Waiting for input: a customer name is required for the report. Type it and press Enter. To skip this prompt, pass --customerName "<name>"; add --unattended for fully non-interactive (CI/automation) runs.
Enter customer name:

With --customerName "..." --unattended, no prompt (and no notice) is shown, as before.

Verification

• dotnet build -c Release — 0 warnings, 0 errors (warnings-as-errors + analyzers).
• Ran the built tool with and without --customerName/--unattended and confirmed the notice appears only when a prompt will actually block.