⚡️ForEach enhancements for massively parallel processing

[anna-geller]

Feature description

Epic with issues related to improving concurrent processing at scale

The reference ID (last issue in the list) can be used for easier filtering of executions triggered from ForEachItem.

Tasks

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1. Name task runs based on iteration values in the Gantt view #2134
   area/frontend enhancement +2
2. Add ForEachItem core task to split a file from internal storage and create a subflow execution for each item or a batch of items #2131
   enhancement +1
   
3. Extend the read() Pebble function to allow reading an internal storage file from the current execution as a string value #2380
   enhancement +1
4. feat(core): add batch properties to ForEachItem #2437
   +0
5. Feat/taskitem progress #2433
   +0
6. feat(core, jdbc): flow concurrency limit #2371
   +0
7. [UI] Add a gray-colored state WARNING in the UI #2439
   enhancement +1
8. [UI] Adjust the Gantt view to track progress of massively parallel subflow executions required by the ForEachItem task #2135
   area/frontend enhancement +2