fix: Make default_environment a top-level setting (meltano#6582)

Closes meltano#6115

src/meltano/cli/cli.py

@@ -1,6 +1,8 @@
+"""Definition of the top-level Click group for the Meltano CLI."""
+
 from __future__ import annotations
 
-import logging  # noqa: D100
+import logging
 import sys
 from typing import NoReturn
 
@@ -77,11 +79,13 @@ def cli(  # noqa: WPS231
         ProjectSettingsService.config_override["cli.log_config"] = log_config
 
     ctx.obj["verbosity"] = verbose
+
     try:  # noqa: WPS229
         project = Project.find()
         setup_logging(project)
+        project_setting_service = ProjectSettingsService(project)
 
-        readonly = ProjectSettingsService(project).get("project_readonly")
+        readonly = project_setting_service.get("project_readonly")
         if readonly:
             project.readonly = True
         if project.readonly:
@@ -94,8 +98,8 @@ def cli(  # noqa: WPS231
             logger.info("No environment is active")
         elif environment:
             selected_environment = environment
-        elif project.meltano.default_environment:
-            selected_environment = project.meltano.default_environment
+        elif project_setting_service.get("default_environment"):
+            selected_environment = project_setting_service.get("default_environment")
             is_default_environment = True
         # activate environment
         if selected_environment:

src/meltano/core/bundle/settings.yml

@@ -1,5 +1,7 @@
 settings:
 # Project
+- name: default_environment
+  value: dev
 - name: send_anonymous_usage_stats
   kind: boolean
   value: true

src/meltano/core/meltano_file.py

@@ -20,7 +20,6 @@ class MeltanoFile(Canonical):
     def __init__(
         self,
         version: int = VERSION,
-        default_environment: str | None = None,
         plugins: dict[str, dict] = None,
         schedules: list[dict] = None,
         environments: list[dict] = None,
@@ -32,7 +31,6 @@ def __init__(
 
         Args:
             version: The meltano.yml version, currently always 1.
-            default_environment: The default environment to use for commands in this project.
             plugins: Plugin configuration for this project.
             schedules: Schedule configuration for this project.
             environments: Environment configuration for this project.
@@ -43,7 +41,6 @@ def __init__(
         super().__init__(
             # Attributes will be listed in meltano.yml in this order:
             version=version,
-            default_environment=default_environment,
             extras=extras,
             plugins=self.load_plugins(plugins or {}),
             schedules=self.load_schedules(schedules or []),