[Feature Request] CodeBlocks cannot disable line numbering

Problem Statement

The line numbering in a CodeBlock is part of the selectable text, so if you copy and paste the code block, the line numbers come too. This is quite unhelpful for actually runnable code. Ideally it would both be possible to disable the line numbers, and when present they would not be copied and pasted along with the code.

For example:

Copies and pastes as:

9
-----------------------------
10
Total (no discount):   £32.86
11
Reduction:             £4.99
12
=============================
13
Total (with discount): £27.87
14
=============================

Proposed solution

Add a CodeBlock parameter to disable line numbering. When it's enabled, it should be non-selectable text. GitHub achieves this for line numbers, and there's a (different) pure CSS example here, and inline here.

Alternatives or Workarounds

Not using CodeBlocks, but I can't find an alternative that offers real monospaced preformatted text in Teams/AdaptiveCard.

Start by locating the CodeBlock entry point and its rendering implementations in the AdaptiveCards repository. Trace how line numbers are generated and copied, then define completion as a parameter that disables numbering and prevents displayed numbers from being included in copied code.