Add contract emails field to mobile contract sql view

CHANGELOG:

### Added
- [#624](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/624) Add contract emails field to mobile contract sql view

Related card: https://trello.com/c/xe3GNsHb/960-a%C3%B1adir-contracte-correus-electr%C3%B2nics

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