Manage post-extraction processing with Google Workflow

[exfalsoquodlibet]

Summary

A Google Workflow now orchestrates the named entities post-extraction processing.

The scheduled workflow consists of three steps and can be found in the src/post_extraction_process/post-extraction-gc-workflow.yaml file.

The first two steps (i.e., creation of named_entities.named_entities_all and named_entities.named_entities_counts BigQuery tables) were first implemented by a scheduled queries in Big Query, which has now been deleted from the repository.

Documentation has been added or updated.

Checklists

This pull/merge request meets the following requirements:

• [x] code runs
• [x] developments are ethical and secure
• [x] you have made proportionate checks that the code works correctly
• [x] test suite passes
• [x] developments adhere to AQA plan (see docs/aqa/aqa_plan.md)
• [ ] data log updated (see docs/aqa/data_log.md), if necessary
• [x] assumptions, and caveats log updated (see docs/aqa/assumptions_caveats.md), if necessary
• [x] minimum usable documentation written in the docs folder

Comments have been added below around the incomplete checks.