feat: port upstream service changes (9.28.0 → 9.29.1+) into the extract

[AakashHotchandani]

Why

The extract was copied from webdriverio/webdriverio at ~9.28.0. The monorepo has since shipped several @wdio/browserstack-service changes (npm latest is now 9.29.1) that are not in this repo. Publishing from here without them would ship an older codebase under a newer version — a regression for users. (PR #39 only synced this repo's own main, which is the old-flat gRPC core — a different source.)

What's ported (net service-src delta, v9.28.0 → upstream main — 20 files, +823/−46)

PR	Type
#15335	feat	one-to-many Test-Case-ID tagging (setCustomTestCaseId) — new customTags.ts, custom-tags-handler.ts, cli/modules/customTagsModule.ts + service/insights wiring
#15259	feat	Load Testing Service (LTS) support (isLoadTestingSession, LTS session id, gRPC/testHub)
#15310	fix	finish the correct test/hook on mocha timeout (service.ts, types.ts)
#15331	fix	isolate per-batch failures in the request queue
#15379	fix	ship a11y Browser type augmentations
#15358	fix	upgrade yauzl → ^3.4.0 (node hang on zip) — lockfile updated minimally (yauzl-only)

Method & validation

• Per-file 3-way merge (base = upstream v9.28.0, theirs = upstream main, ours = this repo) so upstream changes and this repo's own changes both survive.
• ✅ The earlier Semgrep fix (new RegExp(...) → endsWith/slice in util.ts/insights-handler.ts) is preserved.
• ✅ 0 merge conflicts; npm run build (buf generate + esbuild + tsc) passes (build/index.js 2.6mb).
• Lockfile change is yauzl-only (^3.0.0→^3.4.0, resolved 3.4.0) via --legacy-peer-deps=false to stay CI-consistent.

Notes

• Base is the PR feat: monorepo conversion — add @wdio/browserstack-service alongside the gRPC core #37 branch so parity lands before feat: monorepo conversion — add @wdio/browserstack-service alongside the gRPC core #37 merges to main.
• #15316 ("reloadsession finishedmetadata") is not a merged monorepo commit (open PR / different id) — capture when it merges, or route to this repo.
• @wdio/utils #15305 etc. are separate published packages the service consumes as deps — not ported here.
• ⚠️ Ongoing drift: until the monorepo copy is removed, new service PRs there need porting — hence the request to freeze/route monorepo service PRs.

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