Add proper migration for "Organization" -> "Affiliation" change

[yarikoptic]

In #266 (comment) @candleindark identified oddity in our metadata records, that Affiliation records include fields which are not part of the Affiliation model, e.g.

https://api.dandiarchive.org/api/dandisets/000029/versions/draft/info/ ATM has

                "affiliation": [
                    {
                        "name": "An Institution",
                        "roleName": [],
                        "schemaKey": "Affiliation",
                        "contactPoint": [],
                        "includeInCitation": false
                    }
                ],

after doing archeological metadata expedition we figured that it is 99% likely due to

• edd44f6 by @satra

where affiliations got their own Affiliation class. But migrate() function was not adjusted to filter them out somehow... but here we do not even need explicit migration since pydantic likely to do the right thing:

In [10]: Affiliation.model_construct(**{
    ...:                         "name": "An Institution",
    ...:                         "roleName": [],
    ...:                         "schemaKey": "Organization",
    ...:                         "contactPoint": [],
    ...:                         "includeInCitation": False
    ...:                                             }).model_dump()
Out[10]: 
{'id': None,
 'schemaKey': 'Organization',
 'identifier': None,
 'name': 'An Institution'}

and here is with the full

In [11]: Affiliation(**{
    ...:                         "name": "An Institution",
    ...:                         "roleName": [],
    ...:                         "contactPoint": [],
    ...:                         "includeInCitation": False
    ...:                                             }).model_dump()
Out[11]: 
{'id': None,
 'schemaKey': 'Affiliation',
 'identifier': None,
 'name': 'An Institution'}

so the hypothesis that absence of metadata migration on dandi-archive side, ref:

• Add migrated version metadata endpoint dandi-archive#565

keeps old metadata versions present, and it is so:

dandi@drogon:/mnt/backup/dandi/dandisets$ grep -h schemaVersion */dandiset.yaml  | sort | uniq -c
      8 schemaVersion: 0.4.4
    139 schemaVersion: 0.6.0
     26 schemaVersion: 0.6.2
     85 schemaVersion: 0.6.3
    311 schemaVersion: 0.6.4
     12 schemaVersion: 0.6.6
    111 schemaVersion: 0.6.7
    109 schemaVersion: 0.6.8

which would forbid us to validate using more strict models such as the ones disallowing for extra fields, but also potentially simply having "bugs" due to migration not carried out at all.

On the side of dandi-schema I would like us to check what would happen if we .migrate() metadata records for dandisets -- would they succeed/fail and get rid of those irrelevant values.

[yarikoptic]

ok, the migrate takes dict and returns dict, so we should "manually" code up removal of those extra fields from Affiliation records.

[candleindark]

Per @yarikoptic suggestion, generate a basic table that go through all the public dandisets and print the validation statuses of both before and after the .migrate() function.