fix: strip leading ../ from debian/files entries + add importlib-metadata dep

debian/files on some dpkg versions lists the .buildinfo path with a
leading ../ prefix; prepending another ../ in the mv loop produces
../../ which doesn't exist.  Strip the prefix before the mv.

Also adds python3-importlib-metadata to python3-opentelemetry-api
Depends — opentelemetry.util._importlib_metadata unconditionally
imports it.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Vitexus

debian/Jenkinsfile

@@ -66,9 +66,9 @@ distributions.each { distro ->
                         sh 'sudo chown jenkins:jenkins ..'
                         sh 'sudo rm -rf debian/$(dpkg-parsechangelog --show-field Source)/ debian/.debhelper/ debian/tmp/'
                         sh 'debuild-pbuilder -r"sudo -E" -i -us -uc -b'
-                        sh 'mkdir -p $WORKSPACE/dist/debian/ ; rm -rf $WORKSPACE/dist/debian/* ; for deb in $(cat debian/files | awk \'{print $1}\'); do mv "../$deb" $WORKSPACE/dist/debian/; done'
+                        sh 'mkdir -p $WORKSPACE/dist/debian/ ; rm -rf $WORKSPACE/dist/debian/* ; for deb in $(cat debian/files | awk \'{print $1}\' | sed \'s|^\\.\\./ *||\'); do mv "../$deb" $WORKSPACE/dist/debian/; done'
                         artifacts = sh (
-                            script: "cat debian/files | awk '{print \$1}'",
+                            script: "cat debian/files | awk '{print \$1}' | sed 's|^\\.\\./||'",
                             returnStdout: true
                         ).trim().split('\n')
                     }