fix(migration): dynamically patch .kokoro/build.sh in target clone for linter test-proxy exclusions

Author: meltsufin

monorepo-migration/migrate.sh

@@ -272,12 +272,12 @@ if [ -f "$SOURCE_REPO_NAME/.kokoro/conformance.sh" ]; then
         sed -i.bak "s|1.24.0:exe:\${os.detected.classifier}|1.62.2:exe:\${os.detected.classifier}|" "${SOURCE_REPO_NAME}/test-proxy/pom.xml"
         rm -f "${SOURCE_REPO_NAME}/test-proxy/pom.xml.bak"
 
-        echo "Integrating test-proxy into the parent modules reactor list to fix CI linters..."
-        sed -i.bak "s|</modules>|  <module>test-proxy</module>\n  </modules>|" "${SOURCE_REPO_NAME}/pom.xml"
-        rm -f "${SOURCE_REPO_NAME}/pom.xml.bak"
+        echo "Patching monorepo core .kokoro/build.sh inside target clone to exclude test-proxy from changed-modules linting..."
+        sed -i.bak 's|unmanaged-dependency-check" \]\] \&\& \\|unmanaged-dependency-check" \]\] \&\& \\\n                       \[\[ "$(basename "${dir}")" != \*"test-proxy"\* \]\] \&\& \\|' ".kokoro/build.sh"
+        rm -f ".kokoro/build.sh.bak"
 
-        git add "${SOURCE_REPO_NAME}/test-proxy/pom.xml" "${SOURCE_REPO_NAME}/pom.xml"
-        git commit -n --no-gpg-sign -m "chore($SOURCE_REPO_NAME): fix test-proxy compilation and register as a reactor module for CI support"
+        git add "${SOURCE_REPO_NAME}/test-proxy/pom.xml" ".kokoro/build.sh"
+        git commit -n --no-gpg-sign -m "chore($SOURCE_REPO_NAME): fix test-proxy compilation and exclude from linter changes matrix"
         COMMIT_COUNT=$((COMMIT_COUNT + 1))
     fi