Feature flag: remove UPDATE_CONDA_STARTUP

This can now be done by using `build.jobs.pre_create_environment`: #10493

readthedocs/doc_builder/python_environments.py

@@ -335,28 +335,7 @@ def conda_bin_name(self):
             return self.config.python_interpreter
         return 'conda'
 
-    def _update_conda_startup(self):
-        """
-        Update ``conda`` before use it for the first time.
-
-        This makes the Docker image to use the latest version of ``conda``
-        independently the version of Miniconda that it has installed.
-        """
-        self.build_env.run(
-            'conda',
-            'update',
-            '--yes',
-            '--quiet',
-            '--name=base',
-            '--channel=defaults',
-            'conda',
-            cwd=self.checkout_path,
-        )
-
     def setup_base(self):
-        if self.project.has_feature(Feature.UPDATE_CONDA_STARTUP):
-            self._update_conda_startup()
-
         if self.project.has_feature(Feature.CONDA_APPEND_CORE_REQUIREMENTS):
             self._append_core_requirements()
             self._show_environment_yaml()

readthedocs/projects/models.py

@@ -1905,7 +1905,6 @@ def add_features(sender, **kwargs):
     MKDOCS_THEME_RTD = "mkdocs_theme_rtd"
     API_LARGE_DATA = "api_large_data"
     DONT_SHALLOW_CLONE = "dont_shallow_clone"
-    UPDATE_CONDA_STARTUP = "update_conda_startup"
     CONDA_APPEND_CORE_REQUIREMENTS = "conda_append_core_requirements"
     ALL_VERSIONS_IN_HTML_CONTEXT = "all_versions_in_html_context"
     CDN_ENABLED = "cdn_enabled"
@@ -1960,10 +1959,6 @@ def add_features(sender, **kwargs):
             API_LARGE_DATA,
             _("Build: Try alternative method of posting large data"),
         ),
-        (
-            UPDATE_CONDA_STARTUP,
-            _("Conda: Upgrade conda before creating the environment"),
-        ),
         (
             CONDA_APPEND_CORE_REQUIREMENTS,
             _("Conda: Append Read the Docs core requirements to environment.yml file"),