feat: [AdsDataManager] remove empty extra_opts from the C# proto library (#8965)

* chore: remove empty extra_opts from the C# proto library
feat: deprecate INVALID_COUNTRY_CODE and add MEMBERSHIP_DURATION_TOO_LONG to the ErrorReason enum
docs: update filter field documentation to clarify case requirements and improve examples
fix!: update publisher_name in PairIdInfo to be required
fix!: update match_rate_percentage in PairIdInfo to be required
fix!: feat: update advertiser_identifier_count in PairIdInfo to be optional

PiperOrigin-RevId: 878469306

Source-Link: googleapis/googleapis@63b4dff

Source-Link: googleapis/googleapis-gen@1670f97
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