* x-lang gbek tests

* Add java test

* missing import

* Move towards standardizing on base64

* url encoded

* More doc

* yapf

* test cleanup

* progress, kick presubmits

* use options

* Additional pieces

* Add pipeline options piece

* Format

* Move gbek into own test class

* Remove python -> java tests (see #36457)

* Simplify to get faster repro

* Get it working, need to figure out actual issue though

* Fix type hinting

* Clean up

* pipeline options tests

* simplify/lint

* resolve gemini comments (minor)

* extra test

* Lint: import ordering