Gatling 3.11 upgrade

[annappropriate]

Description

https://docs.gatling.io/release-notes/oss/upgrading/3.10-to-3.11/#upgrading-the-gatling-gradle-plugin-to-3110

It now uses a --simulation= option to force the desired simulation instead of the non-standard gatlingRun- pattern.

Checklist

Please check if applicable

• Tests have been added (if applicable, ie. when operator codes are added or modified)
• Relevant docs have been added or modified (if applicable, ie. when new features are added or current features are modified)

Relevant issue #

[gold-kou]

LGTM

[kane8n]

Thanks for the PullRequest!
It seems to work fine with gatling 3.11.
However, there seems to be a backward compatibility issue, so please let me check.