ENH Default DB settings to use 4 bytes to store UTF8 characters

[maxime-rainville]

Description

Default DB settings to use 4 bytes to store UTF8 characters

Manual testing steps

Issues

• CMS6: Default to utf8mb4 #11336

Related PR

• ENH Remove old logic to default UTF8 DB setting to 4 bytes recipe-core#102
• DOC Add entry about utf8mb4 encoding update to changelog developer-docs#602

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[GuySartorelli]

LGTM, mirrors what gets included by default right now with recipe-core.
Thanks!