Backport: fix(ai): default missing embedding warnings

[github-actions]

This is an automated backport of #15324 to the release-v6.0 branch. FYI @Kage18
This backport has conflicts that need to be resolved manually.

git cherry-pick output

Auto-merging packages/ai/src/embed/embed-many.test.ts
CONFLICT (content): Merge conflict in packages/ai/src/embed/embed-many.test.ts
Auto-merging packages/ai/src/embed/embed-many.ts
CONFLICT (content): Merge conflict in packages/ai/src/embed/embed-many.ts
Auto-merging packages/ai/src/embed/embed.test.ts
CONFLICT (content): Merge conflict in packages/ai/src/embed/embed.test.ts
Auto-merging packages/ai/src/embed/embed.ts
CONFLICT (content): Merge conflict in packages/ai/src/embed/embed.ts
error: could not apply e3a04191f... fix(ai): default missing embedding warnings (#15324)
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	6.0.184 github npm
@ai-sdk/angular	2.0.185 github npm
@ai-sdk/google	3.0.75 github npm
@ai-sdk/google-vertex	4.0.130 github npm
@ai-sdk/langchain	2.0.190 github npm
@ai-sdk/llamaindex	2.0.184 github npm
@ai-sdk/react	3.0.186 github npm
@ai-sdk/rsc	2.0.184 github npm
@ai-sdk/svelte	4.0.184 github npm
@ai-sdk/vue	3.0.184 github npm
@ai-sdk/xai	3.0.91 github npm