Executor - configurable notifier ID

[krystian-panek-vmltech]

fixes #198

[Copilot]

Pull Request Overview

This PR introduces configurable notifier ID support for the executor component, allowing notifications to be sent to specific notification channels rather than just the default one.

• Adds a configurable notifier ID field to the Executor configuration
• Refactors NotificationManager to support sending messages to specific notifiers by ID
• Consolidates message building logic by moving it from NotificationManager to payload builders

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
Executor.java	Adds notifier ID configuration and updates notification calls to use specific notifier
NotificationManager.java	Refactors to support notifier-specific messaging and removes duplicate message building logic
TeamsPayload.java	Adds message() builder method to consolidate Teams message creation
SlackPayload.java	Adds message() builder method to consolidate Slack message creation

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