Persist CWA mode so -m onPremise is honored #1942
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Paramadon
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Description of the issue
CloudWatch Agent was ignoring the -m onPremise flag on restart and falling back to EC2 mode, which breaks scenarios like Amazon WorkSpaces where IMDS is reachable but the agent should run in onPremise mode.
Description of changes
This change ensures the agent remembers the mode selected during configuration. The agent now writes the chosen mode to env-config.json using a new CWAGENT_MODE constant and restores that value during startup through the translator context. As a result, the agent no longer defaults to EC2 mode if env var CWAGENT_MODE is onPremise.
Tests
Unit tests