refactor: streamline tracing condition checks and clean up deprecated warnings (#3358)

This commit simplifies the conditions for enabling tracing in both the Crew and Flow classes by removing the redundant call to `on_first_execution_tracing_confirmation()`. Additionally, it removes deprecated warning filters related to Pydantic in the KnowledgeStorage and RAGStorage classes, improving code clarity and maintainability.

src/crewai/memory/storage/rag_storage.py

@@ -13,7 +13,6 @@ from crewai.utilities.chromadb import create_persistent_client
 from crewai.utilities.constants import MAX_FILE_NAME_LENGTH
 from crewai.utilities.paths import db_storage_path
 import warnings
-from pydantic.warnings import PydanticDeprecatedSince211
 
 
 @contextlib.contextmanager
@@ -68,7 +67,6 @@ class RAGStorage(BaseRAGStorage):
         # TODO: Remove this once we upgrade chromadb to at least 1.0.8.
         warnings.filterwarnings(
             "ignore",
-            category=PydanticDeprecatedSince211,
             message=r".*'model_fields'.*is deprecated.*",
             module=r"^chromadb(\.|$)",
         )