[Review] fix: Correct enum value for legal hold policy changes (box/box-openapi#581)

[govambam]

Recreated from box#1319 for Macroscope review.

Original PR: box#1319
Status: closed (merged)

Recreated using squash merge commit - exact merged state preserved.

Original PR: box#1319

[macroscopeapp]

Correct enum and counts for legal hold assignment types by changing CreateLegalHoldPolicyAssignmentRequestBodyAssignToTypeField to accept "interactions" and updating counts in LegalHoldPolicyAssignmentCountsField

Update legal hold assignment type from "interaction" to "interactions", adjust deserialization logic, and add ownership and interactions count fields to the legal hold policy schema and serializers.

📍Where to Start

Start with LegalHoldPolicyAssignmentsManager.createLegalHoldPolicyAssignment docs and type handling in src/managers/legalHoldPolicyAssignments.ts, then review schema changes in src/schemas/legalHoldPolicy.ts.

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Macroscope summarized e6101aa.