Fix session cookie being recreated on every export#2471

rfontanarosa wants to merge 4 commits intomastergoogle/ground-platform:masterfrom

rfontanarosa/1160/only-generate-new-session-cookie-when-neededgoogle/ground-platform:rfontanarosa/1160/only-generate-new-session-cookie-when-neededCopy head branch name to clipboard