chore: Remove most unit tests, lint, doc testing from kokoro presubmit (#1459)

* chore: Remote most unit tests, lint, doc testing from kokoro presubmit

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* Update sync-repo-settings.yaml

* support cryptograph>=3.1 (#1454)

* use presubmit config rather than nox.options.session

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* revert to using nox.options.sessions

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Shuowei Li <[email protected]>

Author: 3 people

noxfile.py

@@ -118,16 +118,8 @@
 
 # Sessions are executed in the order so putting the smaller sessions
 # ahead to fail fast at presubmit running.
-# 'docfx' is excluded since it only needs to run in 'docs-presubmit'
 nox.options.sessions = [
-    "lint",
-    "lint_setup_py",
-    "mypy",
-    "format",
-    "docs",
-    "docfx",
     "unit",
-    "unit_noextras",
     "system-3.9",
     "system-3.12",
     "cover",