VortexSession API cleanup pass #4361

Job	Run time
Python (wheel build)	5m 34s
check-java-publish-build (aarch64-unknown-linux-gnu, runs-on=28166964519/runner=arm64-medium/imag...	1m 46s
Rust publish dry-run	21s
check-java-publish-build (x86_64-unknown-linux-gnu, runs-on=28166964519/runner=amd64-medium/image...	1m 17s
Compat check / compat-test	3m 1s
	11m 59s

Provide feedback