[debugger] Replace `PRDIsEmpty(opcode)` activation check with explicit `m_activated` flag

`DebuggerControllerPatch::IsActivated()` uses `PRDIsEmpty(opcode)` (opcode == 0) as the sentinel for "patch not active." The interpreter has valid opcode with value 0, so it requires a workaround to work with existing infrastructure.

We should consider replacing the `PRDIsEmpty` activation check with a single `bool m_activated` field used by both JIT and interpreter paths. This requires updating `ApplyPatch`/`UnapplyPatch` (both execution control paths) to set `m_activated`, auditing all `PRDIsEmpty` call sites that check activation semantics, and verifying DAC/right-side compatibility since the right side currently assumes non-zero opcode + non-zero address = valid patch when reading the patch table out-of-process.

Another solution could be to to force interpreter to not use opcode with value 0 and keep existing check.