Auth API - Update GET/POST affiliation endpoints to support sandbox env

[argush3]

Entities has the need for the following updates to auth api in prod so that sandbox api users are able to test end to end.

Affiliation logic for POST base_auth_url/orgs/{account}/affiliations shoud behave as follows:

• When no Environment-Override header passed in, save affiliation entry as per before where “environment” column in “affiliations” table is null
• When Environment-Override header is passed in, save affiliation entry

Affiliation logic for GET base_auth_url/orgs/{account}/affiliations shoud behave as follows:

• When no Environment-Override header passed in, return just affiliation entries that have null value for “environment” column in “affiliations” table.
• When Environment-Override header is passed in, return affiliation entries where “environment” column is null or environment matches Environment-Override override value(“sandbox”)

[seeker25]

Already deployed to prod

[seeker25]

Reopen if needed