google-vertexai[minor]: Move tests from gauth/webauth into vertexai packages #13559

Job	Run time
Check linting	4m 55s
test-exports / exports-cjs	4m 13s
test-exports / exports-esbuild	4m 26s
test-exports / exports-esm	4m 22s
test-exports / exports-cf	4m 56s
test-exports / exports-tsc	3m 56s
test-exports / exports-vercel	5m 8s
test-exports / exports-vite	4m 0s
	35m 56s

Provide feedback