Wiki formatting buttons do not work in non-Markdown formats

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Copied from #16321 / #16322 (closed) @adamniedzielski:

Description

The formatting buttons in the wiki editor insert Markdown syntax, which isn't the same for other supported formats:

• "Add italic text", "Add a task list" and "Attach a file" do not work in AsciiDoc
• "Add bold text", "Add italic text", "Insert a quote", "Insert code", "Add a task list" and "Attach a file" do not work in RDoc

Proposal

First iteration: Do not display the formatting buttons and "Attach a file" link when a non-Markdown format is selected.

Further iterations: Support these features for all formats.