feat(telegram): render blockquotes as native <blockquote> tags (#14608) (#14626)

Merged via /review-pr -> /prepare-pr -> /merge-pr.

Prepared head SHA: 4a967c51f5
Co-authored-by: lailoo <20536249+lailoo@users.noreply.github.com>
Co-authored-by: sebslight <19554889+sebslight@users.noreply.github.com>
Reviewed-by: @sebslight

src/telegram/format.ts

@@ -46,6 +46,7 @@ function renderTelegramHtml(ir: MarkdownIR): string {
       code: { open: "<code>", close: "</code>" },
       code_block: { open: "<pre><code>", close: "</code></pre>" },
       spoiler: { open: "<tg-spoiler>", close: "</tg-spoiler>" },
+      blockquote: { open: "<blockquote>", close: "</blockquote>" },
     },
     escapeText: escapeHtml,
     buildLink: buildTelegramLink,