O2DPG workflow_runner: New early-file removal feature

[sawenzel]

This implements a major new feature in the O2DPG workflow/pipeline runner.

The runner can now auto-delete artefacts from intermediate stages as soon as these artefacts are no longer needed. For example, we can delete TPC hits, as soon as TPC digitization finishes.

This allows then to operate on smaller disc spaces or to simulate more timeframes within a job.

To use the feature, one needs to provide a "file-access" report with --remove-files-early access_report.json. This report is a "learned" structure containing the list of files that are written/consumed in a workflow and by which task.

Such report needs to be generated, in a prior pilot job with the same workflow, by a user with sudo rights. See here #2126.

This is primarily useful for productions on the GRID, and the idea would be to

(a) for each new MC production, we produce the file-access file in a pilot
job or github actions when releasing software

(b) we then use this file to optimize the disc space in MC productions
on the GRID

This development is related to https://its.cern.ch/jira/browse/O2-4365

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