update legacy_org_id, fetch by legacy user/org ids

[mrmauer]

Context
BE PR

After PR

1. update org's legacy_org_id

legacyId := "<LEGACY_ID>"
orgId, _ := uuid.Parse("c19165e3-4c00-4ed2-a321-98d48d4ea890")

auth.UpdateOrgMetadata(
    orgId,
    UpdateOrg{
        LegacyOrgId: &legacyId,
    }
)

2. fetch/search orgs on the legacy id (case-sensitive string)

auth.FetchOrgByQuery(models.OrgQueryParams{
    LegacyOrgId: &legacyId,
})

3. fetch/search users on the legacy id (case-sensitive string)

auth.FetchUsersByQuery(models.UserQueryParams{
    LegacyUserId: &legacyId,
})

[itailevi98]

lgtm, just want to confirm that this allows for backwards compatibility? (I dont remember if go packages update in place or not)

[mrmauer]

the back-compat works here. chatted offline.