[NowinskiK]

Closes #30

What

New public cmdlet Remove-AdfObjects, which deletes chosen objects from an ADF instance whether or not they are in the source code.

Remove-AdfObjects -ResourceGroupName 'rg' -DataFactoryName 'adf' -Pattern 'pipeline.PL_Old*', 'dataset.*'
Remove-AdfObjects -ResourceGroupName 'rg' -DataFactoryName 'adf' -Pattern 'pipeline.*@Archive*' -WhatIf   # folder Archive + subfolders
Remove-AdfObjects -ResourceGroupName 'rg' -DataFactoryName 'adf' -Option (New-AdfPublishOption -FilePath rules.csv)   # reverse deployment

• -Pattern uses the same type.name[@folder] format as Includes/Excludes. This replaces the separate -Folder/-Recurse parameters proposed in the issue comment, so the module keeps a single pattern format.
• -Option deletes the objects that a deployment with this option would deploy (Includes minus Excludes).
• -WhatIf/-Confirm: all objects are confirmed before any deletion, so a cascade never removes an object that was declined.
• Order: triggers (started ones are stopped first), pipelines, data flows, datasets, linked services, credentials, integration runtimes.
• If a selected object is referenced by another object, that object is deleted first only when it is also selected; otherwise the cmdlet stops with ADFT0034.
• The first failed deletion stops the cmdlet.

Refactoring of Remove-AdfObject (also used by DeleteNotInSource)

• Takes the resource group and factory from $adfInstance instead of the caller's variables.
• The source model is optional; $adfTargetObj (not a parameter) is replaced by $obj.
• Throws ADFT0018 for an unsupported type, instead of a non-terminating Write-Error inside try.
• Retries temporary API errors with Invoke-AdfWithRetry.
• New optional Selection/Deleted parameters limit the cascade and skip objects that were already deleted.

Folders are read through the REST API (Get-AdfObjectFolder), because Az's PSPipeline has no folder property.

Tests

• New test/Remove-AdfObjects.Tests.ps1: 18 unit tests. Az mocks Write-Error; the tests pass under both Stop and Continue. The Remove-AdfObject tests failed before the refactoring.
• generic, Publish-AdfV2FromJson-ErrorHandling, Publish-AdfV2FromJson-DryRun, Invoke-AdfWithRetry and ApplyExclusionOptions pass locally. The delete tests that need Azure run on CI.

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