fix(cli): correctly lint HTML-ish piped from stdin

[tasshi-me]

Summary

This PR will fix #2225 and might fix biomejs/biome-intellij#50

With this PR, the format, lint, and check commands with the --stdin-file-path option will correctly output the result for HTML-ish (Astro/Svelte/Vue) files.

Implementation

According to code of lint for file input, when the input is an Astro/Svelte/Vue file, the linted output must be merged with original input.

That process is missing from the code for stdin, so I added it in this PR.

I considered refactoring the process to be common between std_in.rs and process_file.rs, but I did not do it because I am not familiar with this repository's architecture, and the scope of impact would be larger.

Test Plan

I added some new test cases and new snapshots.

• For each Astro/Svelte/Vue
  • format with --stdin-file-path must finish successfully
  • format --write with --stdin-file-path must finish successfully
  • lint with --stdin-file-path must finish successfully
  • lint --apply with --stdin-file-path must finish successfully
  • lint --apply-unsafe with --stdin-file-path must finish successfully
  • check with --stdin-file-path must finish successfully
  • check --apply with --stdin-file-path must finish successfully
  • check --apply-unsafe with --stdin-file-path must finish successfully

[ematipico]

Thank you!