ANR fix: com.duckduckgo.experiments.impl.Variant.toString

[nalcalag]

Task/Issue URL: https://app.asana.com/0/1202552961248957/1207333077622726/f

Description

Replace logging variants with the VariantConfig class

Steps to test this PR (Optional)

• [ ] Install from branch
• [ ] Go to settings > Developer Settings > Override Privacy Remote Config URL
• [ ] Tap on Reset to default
• [ ] Check app works as expected

No UI changes

[nalcalag]

• #4560 👈
• develop

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