Increase System.IO.FileSystem test coverage

[adamsitnik]

We need tests for:

• reading from and writing to files located on a remote machine (Throws an exception when opening an existing file #54474 and A System.NullReferenceException was throwing when get a **gif** image using Image.FromFile() method #54475, added in [FileStream] add tests for device and UNC paths #54545)
• reading from and writing to files located on a device (FileStream.ReadAsync() with isAsync: true is throwing IOException #54143, added in [FileStream] add tests for device and UNC paths #54545 and add test for opening and reading from device interface #54673)
• using more file systems:
  • Windows NFS server (File writes to Windows NFS share silently fail... #44546)
  • delayed allocations like ext4 from What is the recommended File IO API usage pattern with regards to ext4 delayed allocations? #32600
  • different max file size like FAT32 (System.IO.FileSystem tests fail all over with temp on Fat32 #66544) (test)
  • probably much more than the three above
• writing to a disk that becomes full (Fix: FileStream.Dispose silently fails on Dispose when disk has run out of space #38742)

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Issue Details

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We need tests for:

• reading from and writing to files located on a remote machine (Throws an exception when opening an existing file #54474 and A System.NullReferenceException was throwing when get a **gif** image using Image.FromFile() method #54475)
• using more file systems:
  • Windows NFS server (File writes to Windows NFS share silently fail... #44546)
  • delayed allocations like ext4 from What is the recommended File IO API usage pattern with regards to ext4 delayed allocations? #32600
  • different max file size like FAT32 (test)
  • probably much more than the three above
• writing to a disk that becomes full (Fix: FileStream.Dispose silently fails on Dispose when disk has run out of space #38742)

Author:	adamsitnik
Assignees:	-
Labels:	area-System.IO
Milestone:	7.0.0

[adamsitnik]

@jozkee @stephentoub @carlossanlop PTAL at the list and feel free to add something. I would really love to extend our test coverage in .NET 7.

[carlossanlop]

• Writing to a remote disk that becomes full (we currently have a manual test, not sure if this could be automated).
• Explicitly get results for different filesystems: NTFS, FAT32, EXT4, APFS, etc.