UIDAI has all resident's data, so will it Track Resident Activities?

No, UIDAI database includes only the information which resident has provided at the time of enrollment or update like Name, Address, Gender, Date of Birth, Mobile Number, Email Id, Fingerprints, Iris Scan, and Facial Photograph.

UIDAI has all resident's data, so will it Track Resident Activities?

UIDAI database doesn't contain your bank information about bank accounts, mutual funds, shares, property details, financial details, health records, family details, caste, education, religion etc.
According to Section 32(3) of Aadhaar Act 2016 prohibits UIDAI from controlling, collecting, maintaining, and recording any information about the purpose of authentication either by itself or through any entity.