Backport: [v6.0] fix: more precise default message for tool execution denial

[github-actions]

This is an automated backport of #16804 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/ai/src/ui/convert-to-model-messages.test.ts
CONFLICT (content): Merge conflict in packages/ai/src/ui/convert-to-model-messages.test.ts
Auto-merging packages/ai/src/ui/convert-to-model-messages.ts
CONFLICT (content): Merge conflict in packages/ai/src/ui/convert-to-model-messages.ts
Auto-merging packages/alibaba/src/convert-to-alibaba-chat-messages.ts
CONFLICT (content): Merge conflict in packages/alibaba/src/convert-to-alibaba-chat-messages.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
Auto-merging packages/anthropic/src/convert-to-anthropic-messages-prompt.ts
CONFLICT (content): Merge conflict in packages/anthropic/src/convert-to-anthropic-messages-prompt.ts
Auto-merging packages/cohere/src/convert-to-cohere-chat-prompt.ts
CONFLICT (content): Merge conflict in packages/cohere/src/convert-to-cohere-chat-prompt.ts
Auto-merging packages/deepseek/src/chat/convert-to-deepseek-chat-messages.ts
CONFLICT (content): Merge conflict in packages/deepseek/src/chat/convert-to-deepseek-chat-messages.ts
Auto-merging packages/google/src/convert-to-google-generative-ai-messages.ts
CONFLICT (content): Merge conflict in packages/google/src/convert-to-google-generative-ai-messages.ts
Auto-merging packages/groq/src/convert-to-groq-chat-messages.ts
CONFLICT (content): Merge conflict in packages/groq/src/convert-to-groq-chat-messages.ts
Auto-merging packages/mistral/src/convert-to-mistral-chat-messages.ts
CONFLICT (content): Merge conflict in packages/mistral/src/convert-to-mistral-chat-messages.ts
CONFLICT (modify/delete): packages/open-responses/src/responses/convert-to-open-responses-input.ts deleted in HEAD and modified in 327642b278 ([v6.0] fix: more precise default message for tool execution denial (#16804)).  Version 327642b278 ([v6.0] fix: more precise default message for tool execution denial (#16804)) of packages/open-responses/src/responses/convert-to-open-responses-input.ts left in tree.
Auto-merging packages/openai-compatible/src/chat/convert-to-openai-compatible-chat-messages.ts
CONFLICT (content): Merge conflict in packages/openai-compatible/src/chat/convert-to-openai-compatible-chat-messages.ts
Auto-merging packages/openai/src/chat/convert-to-openai-chat-messages.ts
CONFLICT (content): Merge conflict in packages/openai/src/chat/convert-to-openai-chat-messages.ts
Auto-merging packages/openai/src/responses/convert-to-openai-responses-input.test.ts
CONFLICT (content): Merge conflict in packages/openai/src/responses/convert-to-openai-responses-input.test.ts
Auto-merging packages/openai/src/responses/convert-to-openai-responses-input.ts
CONFLICT (content): Merge conflict in packages/openai/src/responses/convert-to-openai-responses-input.ts
Auto-merging packages/xai/src/convert-to-xai-chat-messages.ts
CONFLICT (content): Merge conflict in packages/xai/src/convert-to-xai-chat-messages.ts
error: could not apply 327642b278... [v6.0] fix: more precise default message for tool execution denial (#16804)
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"