Backport: [v6.0] fix(gateway): accept deprecated warnings in image, speech, transcription, and video responses

[github-actions]

This is an automated backport of #16792 to the release-v5.0 branch. FYI @gr2m
This backport has conflicts that need to be resolved manually.

git cherry-pick output

Auto-merging packages/gateway/src/gateway-image-model.test.ts
CONFLICT (content): Merge conflict in packages/gateway/src/gateway-image-model.test.ts
Auto-merging packages/gateway/src/gateway-image-model.ts
CONFLICT (content): Merge conflict in packages/gateway/src/gateway-image-model.ts
CONFLICT (modify/delete): packages/gateway/src/gateway-speech-model.ts deleted in HEAD and modified in 9c54a9f34c ([v6.0] fix(gateway): accept deprecated warnings in image, speech, transcription, and video responses (#16792)).  Version 9c54a9f34c ([v6.0] fix(gateway): accept deprecated warnings in image, speech, transcription, and video responses (#16792)) of packages/gateway/src/gateway-speech-model.ts left in tree.
CONFLICT (modify/delete): packages/gateway/src/gateway-transcription-model.ts deleted in HEAD and modified in 9c54a9f34c ([v6.0] fix(gateway): accept deprecated warnings in image, speech, transcription, and video responses (#16792)).  Version 9c54a9f34c ([v6.0] fix(gateway): accept deprecated warnings in image, speech, transcription, and video responses (#16792)) of packages/gateway/src/gateway-transcription-model.ts left in tree.
CONFLICT (modify/delete): packages/gateway/src/gateway-video-model.ts deleted in HEAD and modified in 9c54a9f34c ([v6.0] fix(gateway): accept deprecated warnings in image, speech, transcription, and video responses (#16792)).  Version 9c54a9f34c ([v6.0] fix(gateway): accept deprecated warnings in image, speech, transcription, and video responses (#16792)) of packages/gateway/src/gateway-video-model.ts left in tree.
error: could not apply 9c54a9f34c... [v6.0] fix(gateway): accept deprecated warnings in image, speech, transcription, and video responses (#16792)
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".
hint: Disable this message with "git config set advice.mergeConflict false"