chore: remove the CI workflow for the PCRE2 regex engine package

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.github/workflows/ci-regex-engine-pcre2.yml

@@ -1,50 +0,0 @@
-name: 'CI: Regex Engine (PCRE2)'
-
-on:
-  pull_request:
-    paths:
-      - packages/@n8n/regex-engine-pcre2/**
-      - .github/workflows/ci-regex-engine-pcre2.yml
-  push:
-    branches:
-      - master
-    paths:
-      - packages/@n8n/regex-engine-pcre2/**
-
-jobs:
-  checks:
-    name: Checks
-    runs-on: ubuntu-latest
-    defaults:
-      run:
-        working-directory: packages/@n8n/regex-engine-pcre2
-    steps:
-      - name: Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-        with:
-          submodules: recursive
-
-      - name: Setup Node.js
-        uses: ./.github/actions/setup-nodejs
-        with:
-          build-command: pnpm --filter @n8n/regex-engine-pcre2 build
-
-      - name: Typecheck
-        run: pnpm typecheck
-
-      - name: Lint
-        run: pnpm lint
-
-      - name: Test
-        run: pnpm test
-
-      - name: Verify vendored PCRE2 tag signature
-        run: pnpm pcre2:verify-tag
-
-      - name: Verify committed wasm matches native/*.cpp + the pinned PCRE2 submodule
-        run: |
-          EMSDK_VERSION="$(cat .emsdk-version)"
-          EMSDK_DIGEST="$(cat .emsdk-digest)"
-          docker run --rm -v "$(pwd):/src" -w /src \
-            "emscripten/emsdk:${EMSDK_VERSION}@${EMSDK_DIGEST}" \
-            node scripts/wasm/verify.mjs