"anonymous namespace" should be "unnamed namespace" in C++

Environment

• OS and Version: Win & Linux
• VS Code Version: 1.96.2
• C/C++ Extension Version: 1.23.6
• If using SSH remote, specify OS of remote machine:

Bug Summary and Steps to Reproduce

Bug Summary:
In C++, while some people say "anonymous namespace", it's not a thing in the standard. (The only "anonymous" thing I see is unions.) The correct wording is "unnamed namespace" ([namespace.unnamed] in the standard).

Steps to Reproduce:

1. In a C++ file with an unnamed namespace (namespace foo { int bar() { return 42; } }), put the cursor on bar and note that it says ".../{} (anonymous namespace)" in the breadcrumbs at the top.

Expected behavior:

1. put the cursor on bar and note that it says ".../{} (unnamednamespace)" in the breadcrumbs at the top. (or possibly ".../{} (unnamed)"?).

While this is a extremely pedantic, there's enough confusing wording in C++, it's best to be consistent.

Moved here from https://github.com/microsoft/vscode/issues/244455

I searched the vscode-cpptools project for "anonymous" but couldn't find where this string comes from :-/

Configuration and Logs

This isn't relevant.

Other Extensions

No response

Additional context

No response

Reproduce the breadcrumb wording in a C++ file containing an unnamed namespace, then trace the C/C++ extension's breadcrumb or symbol-display entry point. Search the extension and its dependencies for the displayed label, since the issue reports that a repository search for "anonymous" found nothing. Done means the breadcrumb uses the standard term "unnamed namespace" or an agreed shorter form.