removes redundant allow-private-addr from system tests

Following https://github.com/solana-labs/solana/pull/19130
if gce.sh creat is invoked without -P then --allow-private-addr is
implied:
https://github.com/solana-labs/solana/blob/4cc1b1504/net/common.sh#L68-L73

Therefore tests only need to specify:
  USE_PUBLIC_IP_ADDRESSES: "false"

system-test/partition-testcases/gce-5-node-3-partition.yml

@@ -12,7 +12,6 @@ steps:
       CLIENT_OPTIONS: "bench-tps=1=--tx_count 10000 --thread-batch-sleep-ms 250"
       TESTNET_ZONES: "us-west1-a"
       USE_PUBLIC_IP_ADDRESSES: "false"
-      ALLOW_PRIVATE_ADDR: "true"
       ADDITIONAL_FLAGS: "--dedicated"
       APPLY_PARTITIONS: "true"
       NETEM_CONFIG_FILE: "system-test/netem-configs/partial-loss-three-partitions"

system-test/partition-testcases/gce-5-node-single-region-2-partitions.yml

@@ -12,7 +12,6 @@ steps:
       CLIENT_OPTIONS: "bench-tps=1=--tx_count 5000 --thread-batch-sleep-ms 250"
       TESTNET_ZONES: "us-west1-a"
       USE_PUBLIC_IP_ADDRESSES: "false"
-      ALLOW_PRIVATE_ADDR: "true"
       ADDITIONAL_FLAGS: "--dedicated"
       APPLY_PARTITIONS: "true"
       NETEM_CONFIG_FILE: "system-test/netem-configs/complete-loss-two-partitions"

system-test/partition-testcases/gce-partition-once-then-stabilize.yml

@@ -12,7 +12,6 @@ steps:
       CLIENT_OPTIONS: "bench-tps=1=--tx_count 10000 --thread-batch-sleep-ms 250"
       TESTNET_ZONES: "us-west1-a"
       USE_PUBLIC_IP_ADDRESSES: "false"
-      ALLOW_PRIVATE_ADDR: "true"
       ADDITIONAL_FLAGS: "--dedicated"
       APPLY_PARTITIONS: "true"
       NETEM_CONFIG_FILE: "system-test/netem-configs/partial-loss-three-partitions"

system-test/partition-testcases/gce-partition-with-offline.yml

@@ -12,7 +12,6 @@ steps:
       CLIENT_OPTIONS: "bench-tps=1=--tx_count 10000 --thread-batch-sleep-ms 250"
       TESTNET_ZONES: "us-west1-a"
       USE_PUBLIC_IP_ADDRESSES: "false"
-      ALLOW_PRIVATE_ADDR: "true"
       ADDITIONAL_FLAGS: "--dedicated"
       APPLY_PARTITIONS: "true"
       NETEM_CONFIG_FILE: "system-test/netem-configs/complete-loss-two-partitions"

system-test/stability-testcases/gce-perf-stability-5-node-single-region.yml

@@ -15,6 +15,5 @@ steps:
       USE_PUBLIC_IP_ADDRESSES: "false"
       ADDITIONAL_FLAGS: "--dedicated"
       TEST_TYPE: "fixed_duration"
-      ALLOW_PRIVATE_ADDR: "true"
     agents:
       - "queue=gce-deploy"