Remove several fields used less than five times

[cthoyt]

As a follow-up to #2892, this PR removes the following fields, each of which was used less than five times:

• canonical (not needed because of convention)
• documentation (duplicated homepage)
• integration_server (irrelevant)
• label (duplicate of title field)
• releases (trivally computable from repository field)
• wasDerivedFrom (only in NCBITaxon)
• wikidata_template (only in UBERON)
• slack (only in UBERON)

This was done by running the script:

$ python -m obofoundry.remove_field canonical documentation integration_server label releases wasDerivedFrom wikidata_template slack

If you want to see which fields are not frequently used, run:

$ python utils/check_schema.py --max-cutoff 20

key	count	ontologies
twitter	10	go, hp, uberon, chebi, doid, ddpheno, po, cl, disdriv, ddanat
in_foundry	11	obcs, bco, epo, zfs, omit, stato, bcgo, flu, fix, uo, lipro
in_foundry_order	11	pbpko, go, pr, obi, chebi, doid, pato, po, bfo, zfa, xao
funded_by	4	nomen, uberon, eco, kisao
pull_request_added	4	clyh, t4fs, clao, ngbo
issue_requested	3	occo, t4fs, ngbo

[matentzn]

QC issues but the content is great from my perspective

[cthoyt]

@matentzn fixed by adding uv installation to the workflows

[matentzn]

@deepakunni3 I have no issues with these changes and approve of them. Can you sanity check?

[deepakunni3]

Thank you @cthoyt for removing less frequently used fields.
The PR looks good to me 👍

[nataled]

I'm pretty sure in_foundry and in_foundry_order are no longer needed. The tip-off was the list of in_foundry_order, which mirrors the ontologies that passed review to become a full-fledged Foundry member (as opposed to Library). As the 'Foundry' and 'Library' distinctions are no longer made, these tags will not be used anywhere. Please double check against now-in-use processes to make sure.