Add changelog for FF Expert with flow selection context feature

[Steve-Mcl]

Description

Add changelog for expert flow selection and querying with the FF Expert

Related Issue(s)

Checklist

• I have read the contribution guidelines
• I have considered the performance impact of these changes
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
• For blog PRs, an Art Request has been created (instructions)

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Lighthouse	1 paths audited Performance: 85 (🟢 up 31 from production) Accessibility: 80 (no change from production) Best Practices: 100 (🟢 up 8 from production) SEO: 92 (no change from production) PWA: - View the detailed breakdown and full score reports

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