Link formatting issue in message popup

[sryze]

Found a minor bug related to the rust-analyzer popup showing when a project doesn't have a Cargo.toml file. See the screenshot below:

It looks like the message is expected to be rendered as Markdown (the linkedProjects link) but it's showing as plain text instead.

rust-analyzer version: (eg. output of "rust-analyzer: Show RA Version" command, accessible in VSCode via Ctrl/⌘+Shift+P)
rust-analyzer version: 0.3.1958-standalone (5bf2f85 2024-05-09)

rustc version: (eg. output of rustc -V)
rustc 1.77.2 (25ef9e3d8 2024-04-09)

editor or extension: (eg. VSCode, Vim, Emacs, etc. For VSCode users, specify your extension version; for users of other editors, provide the distribution if applicable)
VS Code

relevant settings: (eg. client settings, or environment variables like CARGO, RUSTC, RUSTUP_HOME or CARGO_HOME)

repository link (if public, optional): (eg. rust-analyzer)

code snippet to reproduce:

// add your code here

[sryze]

Seems related to #14366

[roife]

Perhaps it's because VSC doesn't support rendering markdown in messages.

[Veykril]

It does but that part is pasted verbatim from the extension code. We should remove the markdown there as we don't expect other clients to support markdown there currently.