Replace (p)npx with pnpm in publishing and workflow scripts

[alexslavr]

Cherry-pick of #33212

[Copilot]

Pull request overview

Updates CI/publishing workflows to prefer pnpm execution patterns over (p)npx, aligning workflow command execution with the repo’s pnpm-managed monorepo setup (cherry-pick of #33212).

Changes:

• Added root package.json scripts for change-package-scope and make-artifacts-package (both ts-node entrypoints).
• Replaced pnpx usage in multiple GitHub Actions workflows with pnpm exec (and pnpm --filter ... exec where needed).
• Updated package publishing workflow to use pnpm run for the artifact packaging/scope-change steps.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
package.json	Adds root scripts to run TypeScript publishing helpers via pnpm run.
.github/workflows/wrapper_tests.yml	Switches Puppeteer browser install from pnpx to pnpm --filter ... exec.
.github/workflows/themebuilder_tests.yml	Replaces pnpx calls for gulp/stylelint with pnpm exec.
.github/workflows/renovation.yml	Replaces pnpx gulp ... with pnpm exec gulp ....
.github/workflows/packages_publishing.yml	Uses pnpm run scripts instead of npx ts-node ... for publishing helpers.
.github/workflows/demos_visual_tests.yml	Replaces pnpx gulp ... with pnpm exec gulp ... for demos bundling config.
.github/workflows/build_all.yml	Adjusts bundler commands to npx --no-install (still uses npx).

[Copilot]

This workflow still uses npx (now with --no-install) even though the PR title/description says it replaces (p)npx with pnpm. To avoid the mismatch (and to make the step fully deterministic), either switch these invocations to a pnpm-based execution (pnpm exec ... after setting up pnpm in this job) or call the locally-installed binary directly (e.g., from node_modules/.bin) and update the PR title/description accordingly.