[repository] Drop deprecated extid2eid API and friends This will break cwxmlparser based sources. They should be rewritten using a specific parser, based on xml representation or on rqlio. This is harsh but allows a so big cleanup of the code base. Furthermore, it's necessary for asource/extid handling in the entities table which is costly for most app that don't care at all about that... In this cset, delete: * all extid2eid methods * repo._extid_cache handling * [before/after]_entity_insertion source callback * the cwxmlparser and update related tests, notably unittest_datafeed where 'repull' testing has been removed, since it's now handled by the dataimport API and should not be retested there. Related to #15538288 Closes #15538383

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### Requirements for tests in various cubicweb/**/test directories. ###

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## shared by several test folders

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cubicweb-card

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docutils

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Twisted < 16.0.0

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webtest

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## cubicweb/test

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Pygments

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mock

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#fyzz XXX pip install fails

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cubicweb-file

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cubicweb-localperms

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cubicweb-tag

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## cubicweb/devtools/test

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flake8

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## cubicweb/hooks/test

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psycopg2

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## cubicweb/pyramid/test

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pyramid >= 1.5.0

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waitress >= 0.8.9

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wsgicors >= 0.3

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pyramid_multiauth

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## cubicweb/sobject/test

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cubicweb-comment