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Some OIDC providers (notably JumpCloud) return the `groups` claim as
a plain string when the user belongs to a single group, rather than
a single-element array:
Single group: {"groups": "MyGroup"}
Multiple groups: {"groups": ["Group1", "Group2"]}
This causes `json.Unmarshal` to fail with:
cannot unmarshal string into Go struct field OIDCClaims.groups of type []string
This is the same class of issue as juanfont#2293 (FlexibleBoolean for
email_verified). The fix follows the same pattern: introduce a
FlexibleStringSlice type with a custom UnmarshalJSON that accepts
both a string and a []string, and use it for the Groups field in
both OIDCClaims and OIDCUserInfo.