* added lxml end-to-end test

* configured test logging

* prefer /usr/bin/timeout

* added debug logging

* added pdf end to end preprocessing test

* fixed serialization error

* added debug logging

* check pipeline results

* test png output

* fixed element type check

* install poppler-utils into docker image

* add --assume-yes

Bumps [tensorflow-transform](https://github.com/tensorflow/transform) from 0.21.0 to 0.25.0.
- [Release notes](https://github.com/tensorflow/transform/releases)
- [Changelog](https://github.com/tensorflow/transform/blob/master/RELEASE.md)
- [Commits](https://github.com/tensorflow/transform/compare/v0.21.0...v0.25.0

)

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