Backport: fix(bedrock): part-level cache points

[github-actions]

This is an automated backport of #14809 to the release-v6.0 branch. FYI @heiwen
This backport has conflicts that need to be resolved manually.

git cherry-pick output

Auto-merging packages/amazon-bedrock/src/convert-to-bedrock-chat-messages.test.ts
CONFLICT (content): Merge conflict in packages/amazon-bedrock/src/convert-to-bedrock-chat-messages.test.ts
Auto-merging packages/amazon-bedrock/src/convert-to-bedrock-chat-messages.ts
CONFLICT (content): Merge conflict in packages/amazon-bedrock/src/convert-to-bedrock-chat-messages.ts
error: could not apply 9c78e5deb... fix(bedrock): part-level cache points (#14809)
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"

[github-actions]

🚀 Published in:

Package	Version
ai	6.0.176
@ai-sdk/alibaba	1.0.23
@ai-sdk/amazon-bedrock	4.0.103
@ai-sdk/angular	2.0.177
@ai-sdk/anthropic	3.0.76
@ai-sdk/assemblyai	2.0.33
@ai-sdk/azure	3.0.64
@ai-sdk/baseten	1.0.50
@ai-sdk/black-forest-labs	1.0.33
@ai-sdk/bytedance	1.0.14
@ai-sdk/cerebras	2.0.51
@ai-sdk/cohere	3.0.35
@ai-sdk/deepgram	2.0.33
@ai-sdk/deepinfra	2.0.51
@ai-sdk/deepseek	2.0.34
@ai-sdk/elevenlabs	2.0.33
@ai-sdk/fal	2.0.34
@ai-sdk/fireworks	2.0.52
@ai-sdk/gateway	3.0.111
@ai-sdk/gladia	2.0.33
@ai-sdk/google	3.0.70
@ai-sdk/google-vertex	4.0.124
@ai-sdk/groq	3.0.39
@ai-sdk/huggingface	1.0.49
@ai-sdk/hume	2.0.33
@ai-sdk/klingai	3.0.18
@ai-sdk/langchain	2.0.182
@ai-sdk/llamaindex	2.0.176
@ai-sdk/lmnt	2.0.33
@ai-sdk/luma	2.0.33
@ai-sdk/mcp	1.0.41
@ai-sdk/mistral	3.0.36
@ai-sdk/moonshotai	2.0.22
@ai-sdk/open-responses	1.0.15
@ai-sdk/openai	3.0.63
@ai-sdk/openai-compatible	2.0.47
@ai-sdk/perplexity	3.0.33
@ai-sdk/prodia	1.0.31
@ai-sdk/provider-utils	4.0.27
@ai-sdk/react	3.0.178
@ai-sdk/replicate	2.0.33
@ai-sdk/revai	2.0.33
@ai-sdk/rsc	2.0.176
@ai-sdk/svelte	4.0.176
@ai-sdk/togetherai	2.0.51
@ai-sdk/valibot	2.0.28
@ai-sdk/vercel	2.0.49
@ai-sdk/voyage	1.0.4
@ai-sdk/vue	3.0.176
@ai-sdk/xai	3.0.89

[heiwen]

thank you