Backport: docs(runpod): remove deep-cogito v2, add model list and add gpt-oss-120b

[vercel-ai-sdk[bot]]

This is an automated backport of #10180 to the release-v5.0 branch. FYI @TimPietrusky This backport has conflicts that need to be resolved manually.

git cherry-pick output

CONFLICT (modify/delete): content/providers/03-community-providers/22-runpod.mdx deleted in HEAD and modified in 94ee1cb41 (docs(runpod): remove deep-cogito v2, add model list and add gpt-oss-120b (#10180)).  Version 94ee1cb41 (docs(runpod): remove deep-cogito v2, add model list and add gpt-oss-120b (#10180)) of content/providers/03-community-providers/22-runpod.mdx left in tree.
error: could not apply 94ee1cb41... docs(runpod): remove deep-cogito v2, add model list and add gpt-oss-120b (#10180)
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"