[feat]: Remove bundled entrypoint (pfe.min.js)

[bennypowers]

Summary

Remove the bundled entrypoint (pfe.min.js) from @patternfly/elements.

Context

PR #2960 restored the bundled entrypoint but was closed with the note to remove it in PFE5 instead. The bundled entrypoint causes custom element double-registration issues and is not the recommended way to consume the library.

Scope

• Remove elements/pfe.min.js and the build:bundle script
• Remove scripts/bundle.js
• Update elements/package.json to remove main and . export pointing to pfe.min.js
• Update root package.json to remove build:bundle from the build pipeline