Split out from T242087 and T241975
Now that entitysources is used for configuring wikibase in production we can remove usages of the legacy configuration from production.
We should check to see if these settings are used in Wikibase any more (they should not be) as everything should be coming from entity sources (expect the legacy config parsers)
Looking at `EntitySourceDefinitionsLegacyRepoSettingsParser` this probably is:
- [] entityNamespaces
- [] changesDatabase
- [] conceptBaseUri
- [x] foreignRepositories [remove setting](https://gerrit.wikimedia.org/r/c/operations/mediawiki-config/+/701502), [remove global](https://gerrit.wikimedia.org/r/c/operations/mediawiki-config/+/701503)
And for `EntitySourceDefinitionsLegacyClientSettingsParser`:
- [x] foreignRepositories (never set for client)
- [] repositories [remove setting](https://gerrit.wikimedia.org/r/c/operations/mediawiki-config/+/706341), [remove global](https://gerrit.wikimedia.org/r/c/operations/mediawiki-config/+/706342)
- [] repoDatabase [remove setting](https://gerrit.wikimedia.org/r/c/operations/mediawiki-config/+/708308), [remove global](https://gerrit.wikimedia.org/r/c/operations/mediawiki-config/+/708309)
- [] entityNamespaces
- [x] repoConceptBaseUri [remove setting](https://gerrit.wikimedia.org/r/c/operations/mediawiki-config/+/701504), [remove global](https://gerrit.wikimedia.org/r/c/operations/mediawiki-config/+/701505)
- [x] changesDatabase (not even used in the legacy parser) [remove setting](https://gerrit.wikimedia.org/r/c/operations/mediawiki-config/+/701500), [remove global](https://gerrit.wikimedia.org/r/c/operations/mediawiki-config/+/701501)
- [] repoNamespaces (not even used in the legacy parser) [remove setting](https://gerrit.wikimedia.org/r/c/operations/mediawiki-config/+/705857), [remove global](https://gerrit.wikimedia.org/r/c/operations/mediawiki-config/+/705858)
The repositories old legacy thing: https://doc.wikimedia.org/Wikibase/master/php/md_docs_topics_options.html#autotoc_md370
The foreignRepositories old legacy thing: https://doc.wikimedia.org/Wikibase/master/php/md_docs_topics_options.html#foreignRepositories
The new entitysources thing: https://doc.wikimedia.org/Wikibase/master/php/md_docs_topics_entitysources.html
**Acceptance Criteria:๐๏ธ๐**
[] Configuration that is no longer used by wikibase, is no longer set in `mediawiki-config`
[] Replacement config (entity sources config) is set in `mediawiki-config` (this was likely already all done in T214557)