Q) Any pin in CYBT-343026-01 can be interrupt?
A) In Table 4. CYBT-343026-01 Solder Pad Connection Definitions of datasheet you can refer the pins which can be used as GPIO. Any of this can be configured for interrupt.
Q) XRES pin (pad3) can connect to any signal? or it only for reset ?
A) It can be used as only RESET pin. Cannot be used as a GPIO. (Refer - Table 4. CYBT-343026-01 Solder Pad Connection Definitions , in datasheet )