Revert "Add Docker archive support to Linux scanner (#1711)"

[jasonpaulos]

Temporarily revert #1711

[github-actions]

👋 Hi! It looks like you modified some files in the Detectors folder.
You may need to bump the detector versions if any of the following scenarios apply:

• The detector detects more or fewer components than before
• The detector generates different parent/child graph relationships than before
• The detector generates different devDependencies values than before

If none of the above scenarios apply, feel free to ignore this comment 🙂

[Copilot]

Pull request overview

Temporarily reverts PR #1711 by removing Docker-archive (docker save tarball) scanning support from the Linux container detector, restoring the previous set of supported image reference formats.

Changes:

• Removes docker-archive: handling from ImageReference parsing and LinuxContainerDetector local-image scanning flow.
• Deletes the Docker archive-specific unit test.
• Updates Linux detector documentation to remove Docker archive usage instructions.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
test/Microsoft.ComponentDetection.Detectors.Tests/LinuxContainerDetectorTests.cs	Removes the unit test that asserted Docker archive (docker-archive:) scanning behavior.
src/Microsoft.ComponentDetection.Detectors/linux/LinuxContainerDetector.cs	Removes DockerArchive handling in image resolution and local-image scanning path setup.
src/Microsoft.ComponentDetection.Detectors/linux/ImageReference.cs	Removes DockerArchive kind and docker-archive: parsing support.
docs/detectors/linux.md	Removes documentation describing docker-archive: usage.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.0%. Comparing base (d6c5db9) to head (4771c3f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff      @@
##   main   #1715   +/-   ##
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