#0: Add asserts that all txns are completed by end of user kernel on brisc for dedicated noc mode

[tt-aho]

Ticket

Link to Github Issue

Problem description

We added these asserts for ncrisc and eth, but not for brisc. Brisc should also have these asserts to avoid cases where user txns haven't finished.

What's changed

Add watcher asserts in brisk.cc

Checklist

• All post commit CI passes
• Blackhole Post commit CI passes (if applicable)
• Model regression CI passes (if applicable)
• Device performance regression CI passes (if applicable)
• (For models and ops writers) Full new models tests CI passes (if applicable)
• New/Existing tests provide coverage for changes