[CT-1583][Feature] Utilize new way of providing manifest for tasks

[ChenyuLInx]

Once dbt-labs/dbt-core#6357 is done, we should be able to refactor any logic in dbt server that leverage create_task function in lib.py underneath to use core API directly . The goal would be replace the hard coded conditions with a call to the high level API and maybe some customized logic for dbt-server.

dbt-server/dbt_server/services/task_service.py

Lines 33 to 46 in cc6beb5

	if task_name == "run":
	dbt_service.dbt_run(path, args, manifest)
	elif task_name == "seed":
	dbt_service.dbt_seed(path, args, manifest)
	elif task_name == "test":
	dbt_service.dbt_test(path, args, manifest)
	elif task_name == "build":
	dbt_service.dbt_build(path, args, manifest)
	elif task_name == "snapshot":
	dbt_service.dbt_snapshot(path, args, manifest)
	elif task_name == "run_operation":
	dbt_service.dbt_run_operation(path, args, manifest)
	else:
	raise RuntimeException("Not an actual task")

dbt-server/dbt_server/services/dbt_service.py

Lines 165 to 204 in cc6beb5

	def dbt_run(project_path, args, manifest):
	config = create_dbt_config(project_path, args)
	task = create_task("run", args, manifest, config)
	return task.run()
	def dbt_test(project_path, args, manifest):
	config = create_dbt_config(project_path, args)
	task = create_task("test", args, manifest, config)
	return task.run()
	def dbt_list(project_path, args, manifest):
	config = create_dbt_config(project_path, args)
	task = create_task("list", args, manifest, config)
	return task.run()
	def dbt_seed(project_path, args, manifest):
	config = create_dbt_config(project_path, args)
	task = create_task("seed", args, manifest, config)
	return task.run()
	def dbt_build(project_path, args, manifest):
	config = create_dbt_config(project_path, args)
	task = create_task("build", args, manifest, config)
	return task.run()
	def dbt_run_operation(project_path, args, manifest):
	config = create_dbt_config(project_path, args)
	task = create_task("run_operation", args, manifest, config)
	return task.run()
	def dbt_snapshot(project_path, args, manifest):
	config = create_dbt_config(project_path, args)
	task = create_task("snapshot", args, manifest, config)
	return task.run()

Acceptance Criteria
The listed code paths are no longer being used, so they should be deleted.

[ChenyuLInx]

Code listed above should no-longer in active call path, we should be able to just remove them

[ChenyuLInx]

Gonna cover this in dbt-labs/dbt-core#7093