`get_full_key_name` infinite loop causes out of memory errors on analyst systems

[atcuno]

I haven't been able to complete a full testing run as this function caused my testing VM (8 cores, 16GB RAM) to OOM and crash:

volatility3/volatility3/framework/symbols/windows/extensions/registry.py

Line 134 in b1a42d9

def get_full_key_name(self) -> str:

I tested one of the problematic samples (Win10Browsers_Mem.zip.lime) and it was going in an infinite loop due to smear and the string building was causing the VM to crash from such rapid memory usage.

The fix needs to include the maximum count + the usual seen usage.