Refactor LoadMethod.LOCAL to use symlinks as opposed to copying the dbt source dir

[tatiana]

As of Cosmos 1.0-1.2, it copies the entire dbt project for every operator that runs dbt:

astronomer-cosmos/cosmos/operators/local.py

Line 198 in c82e6bc

shutil.copytree(

As reported in the #airflow-dbt slack, this can lead to performance issues:
https://apache-airflow.slack.com/archives/C059CC42E9W/p1697718075031609?thread_ts=1697708239.918849&cid=C059CC42E9W

We successfully adopted a strategy of using symbolic links from a temporary folder to run dbt ls:

astronomer-cosmos/cosmos/dbt/graph.py

Lines 167 to 171 in c82e6bc

	tmpdir_path = Path(tmpdir)
	ignore_paths = (DBT_LOG_DIR_NAME, DBT_TARGET_DIR_NAME, "dbt_packages", "profiles.yml")
	for child_name in os.listdir(self.project.dir):
	if child_name not in ignore_paths:
	os.symlink(self.project.dir / child_name, tmpdir_path / child_name)

The goal with this ticket is to adopt this same strategy when running tasks using LoadMethod.LOCAL.

[jbandoro]

I can work on this one, in #629 to reduce complexity I created the function:

astronomer-cosmos/cosmos/dbt/graph.py

Lines 56 to 61 in 9cd46d2

	def create_symlinks(project_path: Path, tmp_dir: Path) -> None:
	"""Helper function to create symlinks to the dbt project files."""
	ignore_paths = (DBT_LOG_DIR_NAME, DBT_TARGET_DIR_NAME, "dbt_packages", "profiles.yml")
	for child_name in os.listdir(project_path):
	if child_name not in ignore_paths:
	os.symlink(project_path / child_name, tmp_dir / child_name)

which could be used here in DbtLocalBaseOperator.run_command.