Notifications skipped for health checker

[krystian-panek-vmltech]

fixes #281

[Copilot]

Pull request overview

This PR ensures that health-check executions of the code executor do not emit notifications, preventing repeated Slack messages when the console executable is configured for notifications (fixing #281).

Changes:

• Introduced a notifications boolean flag in ExecutionContext, defaulting to true, with corresponding getter/setter.
• Updated Executor.handleNotifications to respect the per-execution notifications flag before sending any notifications.
• Updated HealthChecker.checkCodeExecutor to disable both history and notifications for the health-check execution context.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
core/src/main/java/dev/vml/es/acm/core/code/ExecutionContext.java	Adds a per-execution notifications flag (default true) with accessors, parallel to existing history/debug flags.
core/src/main/java/dev/vml/es/acm/core/code/Executor.java	Extends the notification guard to skip sending notifications when execution.getContext().isNotifications() is false.
core/src/main/java/dev/vml/es/acm/core/instance/HealthChecker.java	Disables notifications on the health-check ExecutionContext so health-check runs of the console script do not trigger Slack messages.

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