feat: add deletion task to job definitions and update related configu…

[razbroc]

Question	Answer
Bug fix	✖
New feature	✔
Breaking change	✖
Deprecations	✖
Documentation	✖
Tests added	✖
Chore	✔

This pull request introduces support for a new "deletion" task type throughout the codebase. The main changes involve updating configuration files, interfaces, and handlers to recognize and handle the new task type, ensuring it is integrated into the task flow and appropriately excluded where necessary.

Configuration and Task Flow Updates:

• Added deletion as a recognized task type in configuration files, including helm/values.yaml, helm/templates/configmap.yaml, and config/custom-environment-variables.json. [1] [2] [3]
• Included tiles-deletion in the taskFlowManager.ingestionTasksFlow in helm/values.yaml, integrating deletion into the ingestion workflow.

Interface and Handler Adjustments:

• Updated the IJobDefinitionsConfig interface in src/common/interfaces.ts to include the new deletion task type.
• Modified the IngestionJobHandler in src/tasks/handlers/ingestion/ingestionHandler.ts to add the deletion task type to the list of excluded types, preventing its duplication in certain scenarios.

Documentation:

• Updated the README.md to document the new JOB_DEFINITIONS_TASK_DELETION environment variable.