side-data: add a test to check sidedata upgrade
We want to make sure that sidedata computed at commit time and during upgrade
are the same. To do so, we upgrade the repository in `test-copies-chain-merge.t`
since the file is checking all the special case that we need to catch. The
sidedata content in both case should be the same.
Differential Revision: https://phab.mercurial-scm.org/D9124
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"base": "hg:.^"
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