fix(dpkg): de-duplicate same packages with different filePaths from different layers

[DmitriyLewen]

Description

We remove duplicates for debian packages from one layers:

trivy/pkg/fanal/analyzer/pkg/dpkg/dpkg.go

Lines 202 to 207 in 1f5f348

	pkg = a.parseDpkgPkg(header)
	if pkg != nil {
	pkg.Digest = digests[pkg.ID]
	pkgs[pkg.ID] = pkg
	pkgIDs[pkg.Name] = pkg.ID
	}

But there are cases when same packages with different filePaths are placed in different layers.
We need to de-duplicate these packages.

See #8273 for more details.

Discussed in #8273