Create a Job with the relevant logic from ImportUtil and ImportContentletsAction to successfully import large files

[fabrizzio-dotCMS]

Parent Issue

#29482

Task

Create a Job following the implementation of the Epic
This Job has to use the new BufferedCvsReader to extract the content data from a file to avoid memory issues
It is desirable to be able to start or restart the import from a given row number skipping all previous
The new Job can be instructed to perform a db commit after n rows are saved.
The new method should return an Immutable ImportSumary class instead of a HashMap reporting the results.
Consume a single class with all the required parameters instead of taking a large number of arguments. Right now it takes 15 parameters. When the maximum number of allowed params should be 7. Any private methods created here have to meet these requirements too.
Optionally we can Refactor the method ImportUtil.importFile to reduce its complexity and make it clearer to read and understand. Currently, it is 115 lines and the recommended is 15

Proposed Objective

Core Features

Proposed Priority

Priority 2 - Important

Acceptance Criteria

1. The Job should be able to import successfully a large number of content items. e.g. 10K items.
2. The Job should never get stuck or run out of memory.
3. The same options passed to the Structs Action (preview, import, fields, and key selections should be accepted by this job) Since the functionality should remain as it is now.

External Links... Slack Conversations, Support Tickets, Figma Designs, etc.

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Assumptions & Initiation Needs

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Quality Assurance Notes & Workarounds

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Sub-Tasks & Estimates

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