remove hardcoded historical values from the webapp

The webapp injects hardcoded historical values[1] on the historical data to fill the gap. It works pretty well on production but disturbs the rendering on other environments.

This patch should be removed and the data add on the static data used to generate the complete history.

• [1] https://forge.softwareheritage.org/source/swh-web/browse/master/swh/web/misc/urls.py$31

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Migrated from T3232 (view on Phabricator)