[BOLT][TEST] Replace cache+ option with ext-tsp

Replace "cache+" with "ext-tsp" in all BOLT tests

Test Plan:
```
ninja check-bolt
grep -rnw . -e "cache+"
```
no more tests containing "cache+"
"cache+" and "ext-tsp" are aliases

Reviewed By: rafauler

Differential Revision: https://reviews.llvm.org/D126714