[Code Health] [Firestore Rules] Errors in Firestore rules on deploy

[gino-m]

⚠  [W] 93:14 - Unused function: canCollectData.
⚠  [W] 93:29 - Unused variable: survey.
⚠  [W] 94:42 - Invalid variable name: surveyId.

[rfontanarosa]

the only warning message now is:
i cloud.firestore: checking firestore/firestore.rules for compilation errors...
⚠ [W] undefined:undefined - Ruleset uses old version (version [1]). Please update to the latest version (version [2]).