Internal: Move product pulse to shared elementor-editor-github-actions [ED-24831] (#36486)

## Summary
- Replaces this repo's inline product-pulse workflow (merged in #36412,
still on the unpatched version) with a thin caller of
`elementor/elementor-editor-github-actions/actions/product-pulse` — see
[elementor/elementor-editor-github-actions#42](elementor/elementor-editor-github-actions#42)
- The generic prompt (goal, decision criteria, type classification,
writing style, output format, examples) now lives in that action's
shared `prompt-template.md`, since it was ~85% byte-identical to
elementor-pro's copy
- Passes `product-name: 'Elementor'` directly — no per-file-path
product-area mapping; every pulse from this repo is simply tagged
"Elementor"
- Removes `.github/extract-pulse-json.py` (now lives in the shared
action's `scripts/`)
- Companion PR in elementor-pro:
[elementor/elementor-pro#7275](elementor/elementor-pro#7275)

## Test plan
- [ ] Merge a chore-only PR after this lands and confirm no Slack pulse
is posted
- [ ] Merge a feature/fix PR and confirm the Slack pulse fires tagged
"Elementor" with the correct type-based header
- [ ] Verify `elementor/elementor-editor-github-actions#42` is merged
before merging this PR (the `@main` ref must resolve)

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### ✨ PR Description
## 1. Problem & Context
Extracting product pulse logic into a shared reusable GitHub Action
(ED-24831) reduces duplication and maintenance burden across Elementor
repositories.

## 2. What Changed (Where)
* `.github/workflows/product-pulse.yml`: Replaced 270+ lines of inline
bash/script logic with single composable action call; added `actions:
read` permission
* `.github/extract-pulse-json.py`: Removed (logic now encapsulated in
shared action)

## 3. How It Works
Workflow now delegates entire pipeline to
`elementor/elementor-editor-github-actions/actions/product-pulse@main`
via single step, passing PR metadata and secrets as inputs. Shared
action owns PR fetching, Cursor API calls, JSON parsing, and Slack
notifications.

## 4. Risks
Action availability: shared action repo must stay stable/accessible.
Credential management: ensure `elementor-editor-github-actions` repo has
equivalent secret handling. No rollback plan if shared action
breaks—mitigate with pinning to specific commit hash instead of `@main`.

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---------

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: Netanel Baba <50736016+Ntnelbaba@users.noreply.github.com>
Co-authored-by: ElementorBot <48412871+elementorbot@users.noreply.github.com>

Author: 4 people