Given an Account ID and a new Industry value, update the Account Industry field. Then update all related Contacts by setting their Department field to match the new Industry. Return the total count of records updated (Account + Contacts). Use Database methods with allOrNone=false for error tolerance.
Examples:
Input: accountId = '001...', newIndustry = 'Technology'
Output: 5
Explanation: 1 Account updated + 4 related Contacts updated = 5 total records
Input: accountId with no contacts, newIndustry = 'Finance'
Output: 1
Explanation: Only the Account is updated, no contacts exist
Input: accountId = null, newIndustry = 'Technology'
Output: 0
Explanation: Null account ID results in zero updates
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