Integrate meta-seconorth-distro/add-manifest-and-testdata-files-to-release-artifacts-for-dunfell

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Commit: seco-ne/yocto/layers/meta-seconorth-distro@58db9895

Refactoring: remove DISTRO_IMAGES variable

DISTRO_IMAGES was passed to the CI package stage only to add the
corresponding manifest and testdata.json files as well. Add these
directly to DISTRO_RELEASE_ARTEFACTS and remove DISTRO_IMAGES variable.

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Commit: seco-ne/yocto/layers/meta-seconorth-distro@b0f41c8e

Refactoring: append to DISTRO_IMAGES for FNGSystem instead of redefining it

${IMAGE_LINK_NAME}.cpio.gz is part of DISTRO_IMAGES automatically due to
its original definition in seconorth-distro.inc. Append
${IMAGE_LINK_NAME}.tgz to make clear that this is an addition compared
to the Yocto build.

default.xml

@@ -22,7 +22,7 @@
     <project name="meta-freescale.git"              revision="5a026be5a6b29a27a7754d7fa5d4765c99f98ed9"  remote="fslc"         path="sources/meta-freescale"            />
     <project name="meta-freescale-distro.git"       revision="5d882cdf079b3bde0bd9869ce3ca3db411acbf3b"  remote="fslc"         path="sources/meta-freescale-distro"     />
     <project name="layers/meta-seconorth-machine"   revision="9ddd0ffa27e9ae0610ec4ede27f47452513d4c35"  remote="seco-ne"      path="sources/meta-seconorth-machine"    />
-    <project name="layers/meta-seconorth-distro"    revision="ab5cbf156a99ce321a584d0d3f98d99a41631604"  remote="seco-ne"      path="sources/meta-seconorth-distro"     />
+    <project name="layers/meta-seconorth-distro"    revision="58db9895fefb0d021b1dd75db2437cd29f2d3f32"  remote="seco-ne"      path="sources/meta-seconorth-distro"     />
     <project name="layers/meta-seconorth-nogplv3"   revision="d7575f7987f5efc74e5800fbfd1739b1e91d381c"  remote="seco-ne"      path="sources/meta-seconorth-nogplv3"    />
     <project name="config"                          revision="46886ef3b6393d647af3e9ae0b5814fbe99d5155"  remote="seco-ne"      path=".conf"                              >
         <linkfile dest="setup-environment" src="setup-environment" />