feat(TE-4324): propagate testName from session capabilities to snapshot options

[sushobhit-lt]

Summary

• Adds `testIdTestNameMap` (Map<testId, testName>) cache parallel to existing `sessionTestIdMap`, so that `testName` is restored on subsequent LTMS-fallback cache hits without re-calling LSRS.
• Populates `snapshot.options.testName` from the LSRS `getSmartUICapabilities` response across all 3 resolution paths: Redis-success, `sessionCapabilitiesMap` cache-hit, and LTMS-fallback.
• Adds optional `testName` to the `Snapshot.options` type.
• Part of a 3-repo change — `testName` rides on `snapshot.options` (same mechanism as `testId`/`sessionId` today), gets uploaded to S3 with the snapshot, and is later read by DOTUI for the outbound Kafka payload to DES.

Related PRs

• LSRS: `TE-4324` on `sushobhit-lt/smartui-rendering-service`
• DOTUI: `TE-4324` on `sushobhit-lt/dotlapse-visual-ui-pixel-private`

Test plan

• `npm run build` passes
• With a real Selenium/Playwright session, log `snapshot.options.testName` before S3 upload — confirm populated
• Exercise all 3 caps-resolution paths (Redis-success, cache-hit, LTMS-fallback) and verify testName is set in each
• Confirm `testIdTestNameMap` gets populated on first resolve and is used on subsequent snapshots with same sessionId
• Backward compat: snapshot without `sessionId` (pure CLI path) — `testName` stays empty, no errors

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