Added is all of operator to member label filters

[kevinansfield]

Summary

• Added an is all of operator to member Label filters
• Serialized all-of label filters as grouped NQL, e.g. (label:alpha+label:vip)
• Preserved ungrouped repeated label filters as separate filter rows when parsing back to UI state

Issue

ref https://linear.app/ghost/issue/BER-3664/add-is-all-of-operator-to-member-label-filters

Validation

• pnpm --filter @tryghost/posts exec vitest run src/views/members/member-filter-query.test.ts src/views/filters/filter-codecs.test.ts src/views/members/member-fields.test.ts src/views/members/use-member-filter-fields.test.ts
• pnpm --filter @tryghost/posts build

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[kevinansfield]

Closing because this PR was accidentally opened from my fork. Replaced by upstream-backed draft PR #27945.