chore(system_monitor): disable traffic monitor

[iwatake2222]

Description

launcher change for autowarefoundation/autoware.universe#9069

This PR disables traffic monitor. Traffic monitor is one of modules in system monitor, which measures network traffic by specified programs ( the default target program is greengrass ).

The traffic monitor uses nethogs to monitor network, but the CPU usage of nethogs is high in some systems. This PR adds a new config to enable/disable traffic monitor, but the default setting is enabled for OSS Autoware.Universe

For our usage, network traffic by program is not necessarily collected by default, while network bandwidth and errors are useful. This PR disables traffic monitor only.

Tests performed

nethogs command doesn't run when enable_traffic_monitor is false

Effects on system behavior

Not applicable.

Interface changes

None

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[iwatake2222]

@ito-san
Could you review this PR?
Also, please add label to run build-and-test-differential check.