Ensure the EFI boot directory exists before running BCDBoot

[mpanduru]

BCDBoot can attempt to copy the boot manager before EFI\Microsoft\Boot exists on the EFI system partition when generating images from newer Windows Server 2025 builds. This causes repeated BfspCopyFile failures with error 0x3 (ERROR_PATH_NOT_FOUND).

The issue was observed while generating a Windows Server 2025 image from the 24H2.19 ISO release:

SW_DVD9_Win_Srv_STD_CORE_2025_24H2.19_64Bit_English_DC_STD_MLF_X24-30560.ISO

The image generation produced the following logs:

BFSVC Error: BfspCopyFile(H:\windows\boot\EFI\bootmgfw.efi, \?\GLOBALROOT\Device\HarddiskVolume7\EFI\Microsoft\Boot\bootmgfw.efi) failed! (Attempt 60 of 60) Last Error = 0x3
BFSVC Warning: Failed to copy Boot Manager to Microsoft bootmgfw.efi location. Last error = 0x3

Create the destination directory in Create-BCDBootConfig before invoking BCDBoot for UEFI images. This ensures the directory exists for both the image-provided executable and the host fallback.