Bump ejs and webpack-bundle-analyzer in /etp-public

Removes [ejs](https://github.com/mde/ejs). It's no longer used after updating ancestor dependency [webpack-bundle-analyzer](https://github.com/webpack-contrib/webpack-bundle-analyzer). These dependencies need to be updated together.


Removes `ejs`

Updates `webpack-bundle-analyzer` from 3.8.0 to 4.10.1
- [Release notes](https://github.com/webpack-contrib/webpack-bundle-analyzer/releases)
- [Changelog](https://github.com/webpack-contrib/webpack-bundle-analyzer/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/webpack-bundle-analyzer@v3.8.0...v4.10.1)

---
updated-dependencies:
- dependency-name: ejs
  dependency-type: indirect
- dependency-name: webpack-bundle-analyzer
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>