Update transcoding without tonemapping (VAAPI)

[mik9]

Description

As described in issue #23631:

• Fixed incorrect colors after transcoding HEVC -> HEVC with no tonemapping by removing out_range=pc. Looks like ffmpeg is able to figure it out automatically and doing it better
• Fixed preview and thumbnail images for HDR videos transcoded without tonemapping by force adding tonemapping to image generation
• Fixed transcoding params without scaling
  • VaapiSwDecodeConfig: fixed transcoding from h264 by adding scale_vaapi=format=... (fix(transcode): conditionally fix VAAPI filter order for HEVC on Haswell #18111)
  • VaapiHwDecodeConfig: do not add scale_vaapi if scaling is not required. There might be a possibility that same scale_vaapi=format=... is needed on some hardware but I can't verify it. On my hardware it works without it

Fixes #23631

How Has This Been Tested?

Tested several transcoding options with several videos

AMD Ryzen 5 5600G

• Source=h264, Target=HEVC/h264
  • SW decoder
  • HW decoder
• Source=HEVC, Target=HEVC
  • SW decoder
  • SW decoder + scaling
  • SW decoder + tonemapping
  • SW decoder + scaling + tonemapping
  • HW decoder
  • HW decoder + scaling

HW tonemapping doesn't work on this machine so I can't test it

Intel(R) Core(TM) i5-8265U

• Source=h264, Target=h264
  • SW decoder
  • SW decoder + scaling
  • HW decoder + scaling
• Source=HEVC, Target=h264
  • SW decoder + scaling + tonemapping
  • SW decoder + tonemapping
  • HW decoder + tonemapping (works but wrong colors)
  • HW decoder + scaling + tonemapping (works but wrong colors)

Note: "wrong colors" issue also present with hw tonemapping in main branch so there is no regression

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation if applicable
• I have no unrelated changes in the PR.
• I have confirmed that any new dependencies are strictly necessary.
• I have written tests for new code (if applicable)
• I have followed naming conventions/patterns in the surrounding code
• All code in src/services/ uses repositories implementations for database calls, filesystem operations, etc.
• All code in src/repositories/ is pretty basic/simple and does not have any immich specific logic (that belongs in src/services/)

Please describe to which degree, if any, an LLM was used in creating this pull request.

none

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