feat: remove batch forwarding to kits

[alexs-mparticle]

Summary

Removes the client-side sendBatchToForwarders batch-forwarding path that pushed event batches into kit processBatch. Server-side mParticle integration now handles this data, making the client-side batch-stream forwarding redundant.

This is the SDK-side slice of a broader effort to remove the redundant client-side mParticle → Rokt batch-stream pipeline (the kit and WSDK changes are tracked separately).

Changes

• src/batchUploader.ts — drop the sendBatchToForwarders() call site in createNewBatches.
• src/forwarders.js — remove the sendBatchToForwarders method and its now-unused batch-filtering helper imports (isBatchEventAllowed, filterBatchEventAttributes, filterBatchIdentities).
• test/jest/batchUploader.spec.ts — remove the batch forwarding to kits describe block and its mock.
• test/src/tests-forwarders.ts — remove the batch forwarding describe block.

Notes

• The batch-filtering helpers in src/forwarder-utils.ts (added in feat: enable data filtering for batches #1245) are now only referenced by removed code. They are left in place for this PR to keep the diff scoped; they can be cleaned up in a follow-up.
• Runtime-safe and independent: sendBatchToForwarders already no-op'd for kits without processBatch, so this has no hard ordering dependency on the kit/WSDK changes.

Testing

• npm run lint — clean.
• npm run test:jest — no new failures introduced (pre-existing failures in sdkToEventsApiConverter.ts TS error and an untracked local click-id-refactor/ dir are unrelated to this change).

[cursor]

PR Summary

Medium Risk
Integrations that relied on client-side processBatch will stop receiving batched kit payloads; server-side forwarding is the intended replacement.

Overview
Removes the client-side batch → kit pipeline: event batches are no longer pushed to forwarders via processBatch after createNewBatches.

batchUploader.ts no longer calls _Forwarders.sendBatchToForwarders when a batch is built (including before onCreateBatch). forwarders.js drops sendBatchToForwarders and the batch-specific filter imports it used. Batches still go to mParticle servers and sendEventToForwarders / process() for per-event kit forwarding is unchanged.

Tests for batch forwarding in batchUploader.spec.ts and tests-forwarders.ts are removed. Batch helpers in forwarder-utils.ts may remain unused until a follow-up cleanup.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud