add environment variable MTX_QUERY to some hooks (#2483)

[aler9]

Fixes #2483

[codecov]

Codecov Report

Merging #2522 (11cea22) into main (648e90f) will decrease coverage by 0.07%.
Report is 1 commits behind head on main.
The diff coverage is 93.67%.

@@            Coverage Diff             @@
##             main    #2522      +/-   ##
==========================================
- Coverage   61.08%   61.02%   -0.07%     
==========================================
  Files         138      139       +1     
  Lines       15224    15186      -38     
==========================================
- Hits         9300     9267      -33     
+ Misses       5222     5218       -4     
+ Partials      702      701       -1     

Files	Coverage Δ
internal/core/hls_http_server.go	56.39% <100.00%> (ø)
internal/core/hls_muxer.go	57.46% <100.00%> (-1.18%)	⬇️
internal/core/mpegts.go	18.88% <ø> (ø)
internal/core/path_manager.go	89.92% <100.00%> (+0.08%)	⬆️
internal/core/rtmp_conn.go	69.38% <100.00%> (-0.94%)	⬇️
internal/core/rtsp_conn.go	82.85% <100.00%> (-0.13%)	⬇️
internal/core/srt_conn.go	76.22% <100.00%> (-0.68%)	⬇️
internal/core/webrtc_http_server.go	57.94% <100.00%> (ø)
internal/core/webrtc_session.go	71.14% <100.00%> (-0.77%)	⬇️
internal/core/rtsp_session.go	76.55% <94.11%> (-0.77%)	⬇️
... and 5 more

... and 1 file with indirect coverage changes

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