Tune `ZAllocationSpikeTolerance` for ZGC in all networks

### Description

Performance testing shows that under heavy load the `memTot` metric (the total memory allocated for the heap) hits the specified maximum heap size (currently, `150g`), which correlates with allocation stalls reported by ZGC.
Increasing `ZAllocationSpikeTolerance` from the default 1 to 2 has been shown to improve ZGC proactiveness, help keeping the total memory under the maximum size and eliminate allocation stalls.
It it recommended to set `-XX:ZAllocationSpikeTolerance=2` in all networks.

### Steps to reproduce

Observe the `memTot` metric.

### Additional context

_No response_

### Hedera network

mainnet, testnet, previewnet, other

### Version

v0.33.0

### Operating system

Linux