Bugfix: Skip component cleanup when servicing is pending

[CaioFPeres]

Skip component cleanup when servicing is pending

Check package, feature, and pending-marker state before invoking DISM cleanup. Serviceable builds now skip cleanup with a warning, while Core and component payload removal stop safely when pending work is detected.

Add regression tests and document the behavior.

Without this fix, every build of a serviceable image would fail to clean up the component store, leaving it in an error state and preventing iso build completion.
Problem found on official 26H2 ISO.

Logs (see "Retained because this image has pending servicing operations"):

[Advanced payloads] Remove selected payload files
[Redundant data] Remove redundant offline data
[Redundant data] Skipped cleanup: Windows\SoftwareDistribution\Download: Retained because this image has pending servicing operations.
[Redundant data] Skipped cleanup: Windows\Temp: Retained because this image has pending servicing operations.
[Redundant data] Skipped cleanup: Users\Default\AppData\Local\Temp: Retained because this image has pending servicing operations.
[Redundant data] Skipped cleanup: Windows\Logs\CBS: No redundant files.
[Redundant data] Skipped cleanup: Windows\Logs\DISM: Not present.
[Redundant data] Skipped cleanup: Windows\MEMORY.DMP: Not present.
[Redundant data] Skipped cleanup: Windows\Minidump: Not present.
[Redundant data] Skipped cleanup: ProgramData\Microsoft\Windows\WER\ReportArchive: No redundant files.
[Redundant data] Skipped cleanup: ProgramData\Microsoft\Windows\WER\ReportQueue: No redundant files.
[Redundant data] Remove redundant offline data
[Commit] Save image changes
[Commit] Deployment Image Servicing and Management tool
[Commit] Version: 10.0.26100.9549
[Commit] Saving image
[Commit] Unmounting image
[Commit] The operation completed successfully.