Include expected filename in rssfeed metadata

[jdangerx]

In src/pudl_archiver/archivers/ferc/xbrl.py, we have some logic that generates an informative filename from a filing's metadata. If we want to use that filename elsewhere, we need to reconstruct the filename logic.

We should include the filing name in the metadata, so that is less brittle.

Scope

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1. metadata in rss_feed includes a filename field
2. filename field is used in ferc-xbrl-extractor: src/ferc_xbrl_extractor/instance.py:get_filing_name instead of re-capitulating the logic

[hfireborn]

@catalyst-cooperative/com-dev Is this still open? I'd like to work on this if it would be a good task for a first time contributor

[jdangerx]

It sure is, do you have any questions about it? Separately, if you're coming to office hours today we could talk about it then.