fix: Ignore invalid JSON messages (like NODE_ENV undefined)

[exigow]

Fixes: https://continue-xd.sentry.io/issues/6731751693

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Summary by cubic

Invalid JSON messages (like when NODE_ENV is undefined) are now ignored instead of causing errors in the plugin.

• Bug Fixes
• Added error handling to skip and log invalid JSON messages.

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[exigow]

Marking as draft because I need to fix TODOs + check this changes manually on Monday (we have issues with infra today).

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