feat(configure): support for loading only a subset of the projects

specified by the `TT_ONLY_PROJECTS` environment variable, e.g.:

```bash
TT_ONLY_PROJECTS="tt_um_chip_rom,tt_um_factory_test"
```

configure.py

@@ -31,6 +31,10 @@ class Projects:
         if not os.path.exists(self.project_dir):
             os.makedirs(self.project_dir)
 
+        only_projects = os.getenv("TT_ONLY_PROJECTS")
+        if only_projects:
+            only_projects = only_projects.split(",")
+
         self.projects: List[Project] = []
         project_list = [
             entry
@@ -47,7 +51,7 @@ class Projects:
 
             commit_id_file = os.path.join(project_dir, "commit_id.json")
             if not os.path.exists(commit_id_file):
-                logging.warning(f"no commit_id.json in {project_dir}, skipping")
+                logging.warning(f"no commit_id.json in {project_dir}, skippinggi")
                 continue
 
             commit_id_data = json.load(open(commit_id_file))
@@ -55,6 +59,9 @@ class Projects:
                 logging.warning(f"skipping {project_dir} (skip flag set)")
                 continue
 
+            if only_projects and project_id not in only_projects:
+                continue
+
             project = Project(
                 index,
                 commit_id_data["repo"],