Export-DbaUser - Add schema ownership to exported scripts

[andreasjordan]

This PR adds schema ownership information to the output of Export-DbaUser.

Previously, if a user owned a schema, that ownership was not included in the exported script, causing issues when recreating security contexts.

Changes:

• Added schema ownership iteration and ALTER AUTHORIZATION statement generation
• Supports -Template parameter for placeholder substitution
• Added comprehensive tests for schema ownership export

Fixes #9458

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Generated with Claude Code

[andreasjordan]

@claude we need to exclude the schems owned by @("sa", "dbo", "information_schema", "sys") like in lines 388 and 479.

[claude]

Claude finished @andreasjordan's task in 39s —— View job

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Tasks

• Read the changed code to understand the current schema ownership implementation
• Add exclusion filter for sa, dbo, information_schema, sys schemas
• Commit and push the change

Done

Added the exclusion filter to the #Schema Ownership loop in Export-DbaUser.ps1 (line 566), matching the same pattern used at lines 388 and 479:

foreach ($schema in $db.Schemas | Where-Object { $_.Owner -eq $dbuser.Name -and @("sa", "dbo", "information_schema", "sys") -notcontains $_.Name }) {

This excludes schemas named sa, dbo, information_schema, or sys from the ALTER AUTHORIZATION output, consistent with how the existing database and object permission exports filter out those system principals.
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[andreasjordan]

@claude we need to exclude the schema "guest" as well.

[claude]

Claude finished @andreasjordan's task in 33s —— View job

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Tasks

• Read the changed code to understand the current schema ownership implementation
• Add "guest" to the exclusion filter for schema ownership
• Commit and push the change

Done

Added "guest" to the exclusion list in the #Schema Ownership loop in Export-DbaUser.ps1 (line 566):

foreach ($schema in $db.Schemas | Where-Object { $_.Owner -eq $dbuser.Name -and @("sa", "dbo", "information_schema", "sys", "guest") -notcontains $_.Name }) {