[eslint/imports/no-boundary-crossing] don't allow package tests to import outside of packages (#142166)

packages/kbn-repo-source-classifier/src/pkg_info.ts

@@ -13,4 +13,6 @@ export interface PkgInfo {
   rel: string;
   /** Absolute path to the package directory */
   pkgDir: string;
+  /** Is the package a bazel package? If false, then the package is a "synthetic" plugin package */
+  isBazelPackage: boolean;
 }

packages/kbn-repo-source-classifier/src/repo_path.ts

@@ -93,6 +93,7 @@ export class RepoPath {
           pkgDir,
           pkgId,
           rel,
+          isBazelPackage: this.resolver.isBazelPackage(pkgId),
         };
       }
     }