community: callbacks guard_imports (#21173)

Issue: we have several helper functions to import third-party libraries
like import_uptrain in
[community.callbacks](https://api.python.langchain.com/en/latest/callbacks/langchain_community.callbacks.uptrain_callback.import_uptrain.html#langchain_community.callbacks.uptrain_callback.import_uptrain).
And we have core.utils.utils.guard_import that works exactly for this
purpose.
The import_<package> functions work inconsistently and rather be private
functions.
Change: replaced these functions with the guard_import function.

Related to #21133

libs/community/langchain_community/callbacks/flyte_callback.py

@@ -1,4 +1,5 @@
 """FlyteKit callback handler."""
+
 from __future__ import annotations
 
 import logging
@@ -8,6 +9,7 @@ from typing import TYPE_CHECKING, Any, Dict, List, Tuple
 from langchain_core.agents import AgentAction, AgentFinish
 from langchain_core.callbacks import BaseCallbackHandler
 from langchain_core.outputs import LLMResult
+from langchain_core.utils import guard_import
 
 from langchain_community.callbacks.utils import (
     BaseMetadataCallbackHandler,
@@ -26,17 +28,12 @@ logger = logging.getLogger(__name__)
 
 def import_flytekit() -> Tuple[flytekit, renderer]:
     """Import flytekit and flytekitplugins-deck-standard."""
-    try:
-        import flytekit
-        from flytekitplugins.deck import renderer
-    except ImportError:
-        raise ImportError(
-            "To use the flyte callback manager you need"
-            "to have the `flytekit` and `flytekitplugins-deck-standard`"
-            "packages installed. Please install them with `pip install flytekit`"
-            "and `pip install flytekitplugins-deck-standard`."
-        )
-    return flytekit, renderer
+    return (
+        guard_import("flytekit"),
+        guard_import(
+            "flytekitplugins.deck", pip_name="flytekitplugins-deck-standard"
+        ).renderer,
+    )
 
 
 def analyze_text(