CI perf workflow: fix the deploy step.. take two (@W-19345469@)

[vmarta]

This is the 2nd attempt at fixing the deploy step. This time uses the correct API key.

Related PR: #3091

How to test the changes

To simulate running the workflow, here's what I did:

1. From the root, generate a project with the preset: node e2e/scripts/generate-project.js --project-key retail-react-app-performance-tests
2. Then deploy: npm run push -- --projectSlug q4-pwa-perf-develop --message "test pushing a bundle" --target production --cloud-origin <cloud origin> --wait

OR actually, you can see this workflow run where it passes and working as expected: https://github.com/SalesforceCommerceCloud/pwa-kit/actions/runs/17002182578/job/48205909926

[cc-prodsec]

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[vmarta]

Correct API key this time around. I've verified by pushing and deploying a bundle from my machine.

[vmarta]

Bonus: add Slack notification, similar to what's done in another workflow:

pwa-kit/.github/workflows/e2e.yml

Lines 271 to 298 in 615e0d6

	notify-slack-pwa-ext:
	needs: [run-generator-retail-app-ext]
	if: ${{ always() }}
	runs-on: ubuntu-latest
	steps:
	- name: Send GitHub Action data to Slack workflow (Generated)
	id: slack-success
	if: ${{ github.event_name == 'schedule' && needs.run-generator-retail-app-ext.result == 'success' }}
	uses: slackapi/slack-github-action@v1.23.0
	with:
	payload: |
	{
	"message": "✅ All PWA Kit ext E2E tests passed!"
	}
	env:
	SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
	- name: Send GitHub Action data to Slack workflow (Generated)
	id: slack-failure
	if: ${{ github.event_name == 'schedule' && needs.run-generator-retail-app-ext.result != 'success' }}
	uses: slackapi/slack-github-action@v1.23.0
	with:
	payload: |
	{
	"message": "❌ One or more PWA Kit ext E2E tests failed! (${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }})"
	}
	env:
	SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}