Add OAK diff on the release pipeline and documentation for editors

[anitacaron]

Add in the RELEASE DEPLOYMENT block in the uberon.Makefile, after the release-diff target the following code:

CURRENT_BASE_RELEASE=$(ONTBASE)/uberon-base.obo

.PHONY: $(TMPDIR)/current-base-release.obo
$(TMPDIR)/current-base-release.obo:
	wget $(CURRENT_BASE_RELEASE) -O $@

release_diff_oak:
	runoak -i simpleobo:$(TMPDIR)/current-base-release.obo diff -X simpleobo:$(RELEASEDIR)/uberon-base.obo -o $(REPORTDIR)/diff_release_oak.md --output-type md

Add release_diff_oak target to the uberon command, in the following code block:

https://github.com/obophenotype/uberon/blob/5008d41b8b377392935c2cdcdbfd733bf9e1bddb/src/ontology/uberon.Makefile#L1412-L1415

### Tasks
- [x] Update `uberon.Makefile` https://github.com/obophenotype/uberon/pull/3377
- [ ] Update documentation about Uberon release to add the OAK diff output in the Release Notes. ([Step 10 on CL documentation](https://github.com/obophenotype/cell-ontology/blob/master/docs/cl-release.md#generate-the-release-artefacts))

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