I watched the final a couple of years ago in The Crown near the bus station. Pretty much everyone in there was supporting City apart from one big mouthed Chelsea fan who was "invited" to leave at half time. Struggled to book anywhere last time but that was down to COVID regs. The Plumbers might the best bet as it's a decent size and has loads of screens. Like I say Warehouse is huge but I've found it has been full of Student rags cheering on whoever City are playing.
Pubs to avoid for general drinking
The Olde Hatte
Hart Bar
The Black Boy (yes really!)
The Junction
Decent bars
The Rat and Rachet
The Star
The Grove
The Sportsman
The Shoulder of Mutton
Williams in town is nice but pricey