misc: Replace pytest-vcr dependency with pytest-recording

`pytest-vcr` [1] is no longer maintained (last commit was in 2020), and
`VCR.py` recommends [2] `pytest-recording` instead.

Also, `pytest-vcr` does not correctly support `httpx` [3].

This change also removes unused cassettes.

[1] https://github.com/ktosiek/pytest-vcr
[2] https://vcrpy.readthedocs.io/en/latest/usage.html#pytest-integration
[3] ktosiek/pytest-vcr#46

backend/handler/filesystem/tests/test_fs.py

@@ -1,12 +1,10 @@
 import os
 from pathlib import Path
 
-import pytest
 from handler.filesystem import fs_platform_handler, fs_resource_handler, fs_rom_handler
 from models.platform import Platform
 
 
-@pytest.mark.vcr
 async def test_get_rom_cover():
     path_cover_s, path_cover_l = await fs_resource_handler.get_cover(
         overwrite=False, entity=None, url_cover=""