Identify and fix releases that are stored as revisions

Some releases are stored as revision in the graph (maybe due to an old bug in the git loader?)

For example, look at

https://archive.softwareheritage.org/api/1/origin/2695882/visit/12/

you will see that only 1.0-rc7 is correctly stored as a release, all the others are, incorrectly, revisions.

    "refs/tags/0.9.1": {
        "target": "45b0039a63c5da3164c6c2c3ff5deabea09ae4ba",
        "target_type": "revision",
        "target_url": "/api/1/revision/45b0039a63c5da3164c6c2c3ff5deabea09ae4ba/"
    },
    "refs/tags/0.9.8": {
        "target": "bfafe56602af035f59dcb6a9bd1ac3d68f193052",
        "target_type": "revision",
        "target_url": "/api/1/revision/bfafe56602af035f59dcb6a9bd1ac3d68f193052/"
    },
    "refs/tags/0.9.9": {
        "target": "d56ae79e43ff1b37534370911c8a78ec7f38d437",
        "target_type": "revision",
        "target_url": "/api/1/revision/d56ae79e43ff1b37534370911c8a78ec7f38d437/"
    },
    "refs/tags/1.0-rc1": {
        "target": "7596fdc31c9aa00aed281ccb026a74cabf2383bb",
        "target_type": "revision",
        "target_url": "/api/1/revision/7596fdc31c9aa00aed281ccb026a74cabf2383bb/"
    },
    "refs/tags/1.0-rc2": {
        "target": "00e81c89c29ff3e58745fdaf7abb68daa1389e85",
        "target_type": "revision",
        "target_url": "/api/1/revision/00e81c89c29ff3e58745fdaf7abb68daa1389e85/"
    },
    "refs/tags/1.0-rc4": {
        "target": "9f1f03ad692f3e98e2c3cb447a54de88e8353b0e",
        "target_type": "revision",
        "target_url": "/api/1/revision/9f1f03ad692f3e98e2c3cb447a54de88e8353b0e/"
    },
    "refs/tags/1.0-rc5": {
        "target": "a7cd1f755cba27f903253c418bdf34bb3962405e",
        "target_type": "revision",
        "target_url": "/api/1/revision/a7cd1f755cba27f903253c418bdf34bb3962405e/"
    },
    "refs/tags/1.0-rc6": {
        "target": "942f90e4ab18c4308a524176f804a88f5ce63454",
        "target_type": "revision",
        "target_url": "/api/1/revision/942f90e4ab18c4308a524176f804a88f5ce63454/"
    },
    "refs/tags/1.0-rc7": {
        "target": "3e7076586691d4e363689fbf5374f833289e0b98",
        "target_type": "release",
        "target_url": "/api/1/release/3e7076586691d4e363689fbf5374f833289e0b98/"
    },

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Migrated from T980 (view on Phabricator)