This update fixes an issue where emojis, particularly complex ones like `👨‍🚒`, were being displayed incorrectly due to how they were encoded. The team backported a more robust regex pattern from a recent version of Odoo to ensure all emojis are correctly rendered. This improves the overall email experience for users.

Bug
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Some emoji like `👨‍🚒` are separated, because they are built using `👨 + Emoji_Modifier + 🚒` (`\uFE0F` can also be used to get the variant of the emoji).

Adapt the regex to take into account those Unicode variations.

Task-5491124

This pull request formally signs David Sonnet's Individual Contributor License Agreement for Odoo. This ensures compliance with Odoo's licensing terms and allows David to contribute to the project. The addition of the `dsonnet.md` document provides the necessary legal documentation.

Signing the Odoo Individual Contributor License Agreement v1.0.

Adds `doc/cla/individual/dsonnet.md`.

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