fix: prevent nanosecond timestamp overflow in OTLP conversion

[aayushbaluni]

Problem

OTLP nanosecond timestamp conversion uses BigInt(ms * 1_000_000) where the intermediate multiplication happens in Number space. For large millisecond timestamps (> 2^53 / 1e6), this loses precision before BigInt conversion.

Change

Replace BigInt(ms * 1_000_000) with BigInt(ms) * BigInt(1_000_000) so the multiplication happens entirely in BigInt space, preventing precision loss.

Fixes #3292.

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Latest commit: 63d8305

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[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 17159e56-2e6e-451b-8a3d-16b7bd67644e

📥 Commits

Reviewing files that changed from the base of the PR and between b19cf6d and 63d8305.

📒 Files selected for processing (3)

• apps/webapp/app/v3/eventRepository/common.server.ts
• apps/webapp/app/v3/eventRepository/index.server.ts
• apps/webapp/app/v3/runEngineHandlers.server.ts

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Walkthrough

This is a refactoring that centralizes date-to-nanoseconds conversion logic across three modules in the event repository and run engine handlers. The changes replace three instances of manual BigInt conversion computations with calls to a centralized convertDateToNanoseconds helper function. The function is imported into two modules and used in getNowInNanoseconds, recordRunEvent, and the runRetryScheduled handler. Additionally, calculateDurationFromStart adjusts its arithmetic order to perform multiplication in BigInt space rather than converting the result afterward.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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