refactor(project-info.js): drop support for legacy configuation file

Earlier versions of the cli used to keep the image name in a separate file in the manifest
directory. This was removed in favor of the new json file but the cli continued to migrate from this
old file. Migration code path is now being removed. To properly cleanup your project, make sure you
run the previous major version of the tool at least once, or manually remove the `docker-image` file
from `.libdragon` folder.

BREAKING CHANGE: The cli will no longer migrate the `.libdragon/docker-image` Either make sure you
run the 10.x version once for your project or remove the file manually.

modules/constants.js

@@ -21,6 +21,4 @@ module.exports = /** @type {const} */ ({
   STATUS_ERROR: 1,
   STATUS_BAD_PARAM: 2,
   STATUS_VALIDATION_ERROR: 4,
-
-  IMAGE_FILE: 'docker-image', // deprecated
 });

modules/project-info.js

@@ -14,7 +14,6 @@ const {
   CONFIG_FILE,
   DOCKER_HUB_IMAGE,
   DEFAULT_STRATEGY,
-  IMAGE_FILE,
   LIBDRAGON_SUBMODULE,
   CACHED_CONTAINER_FILE,
   CONTAINER_TARGET_PATH,
@@ -159,15 +158,7 @@ const readProjectInfo = async function (optionInfo) {
     return /** @type {NoProjectInfo} */ (optionInfo);
   }
 
-  const migratedRoot = await findLibdragonRoot();
-
-  // Look for old one for backwards compatibility
-  const projectRoot =
-    migratedRoot ??
-    (await findLibdragonRoot(
-      '.',
-      path.join(LIBDRAGON_PROJECT_MANIFEST, IMAGE_FILE)
-    ));
+  const projectRoot = await findLibdragonRoot();
 
   if (
     !projectRoot &&
@@ -204,7 +195,7 @@ const readProjectInfo = async function (optionInfo) {
 
   log(`Project root: ${info.root}`, true);
 
-  if (migratedRoot) {
+  if (projectRoot) {
     info = {
       ...info,
       ...JSON.parse(
@@ -214,20 +205,6 @@ const readProjectInfo = async function (optionInfo) {
         )
       ),
     };
-  } else {
-    // Cleanup old files and migrate to the new config file
-    const imageFile = path.join(
-      info.root,
-      LIBDRAGON_PROJECT_MANIFEST,
-      IMAGE_FILE
-    );
-    if (await fileExists(imageFile)) {
-      info.imageName = (
-        await fs.readFile(imageFile, { encoding: 'utf8' })
-      ).trim();
-      // Immediately update the config as this is the first migration
-      await Promise.all([writeProjectInfo(info), fs.rm(imageFile)]);
-    }
   }
 
   if (!process.env.DOCKER_CONTAINER) {