Fix validating bulk insert assigning same ID to all items

[KyleAMathews]

Previously, when inserting multiple items with the same key in a single bulk insert operation, later items would silently overwrite earlier ones. This fix adds tracking of keys already processed within the current batch, throwing a DuplicateKeyError when duplicate keys are detected.

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✅ Checklist

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[changeset-bot]

🦋 Changeset detected

Latest commit: 7323748

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 11 packages

Name	Type
@tanstack/db	Patch
@tanstack/angular-db	Patch
@tanstack/db-collection-e2e	Patch
@tanstack/electric-db-collection	Patch
@tanstack/powersync-db-collection	Patch
@tanstack/react-db	Patch
@tanstack/rxdb-db-collection	Patch
@tanstack/solid-db	Patch
@tanstack/svelte-db	Patch
@tanstack/trailbase-db-collection	Patch
@tanstack/vue-db	Patch

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commit: 7323748

[github-actions]

Size Change: +44 B (+0.05%)

Total Size: 87.1 kB

Filename	Size	Change
./packages/db/dist/esm/collection/mutations.js	2.31 kB	+44 B (+1.95%)

ℹ️ View Unchanged

Filename	Size
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./packages/db/dist/esm/utils.js	881 B
./packages/db/dist/esm/utils/browser-polyfills.js	304 B
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./packages/db/dist/esm/utils/comparison.js	852 B
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./packages/db/dist/esm/utils/type-guards.js	157 B

_{compressed-size-action::db-package-size}

[github-actions]

Size Change: 0 B

Total Size: 3.34 kB

ℹ️ View Unchanged

Filename	Size
./packages/react-db/dist/esm/index.js	225 B
./packages/react-db/dist/esm/useLiveInfiniteQuery.js	1.17 kB
./packages/react-db/dist/esm/useLiveQuery.js	1.11 kB
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./packages/react-db/dist/esm/usePacedMutations.js	401 B

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[samwillis]

Lovely and simple

[github-actions]

🎉 This PR has been released!

• @tanstack/db@0.5.9

Thank you for your contribution!