Python: removed old search plugins (microsoft#11035)

### Motivation and Context

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Removed some of the old search samples.

### Description

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These notes will help understanding how your code works. Thanks! -->

### Contribution Checklist

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- [x] The code builds clean without any errors or warnings
- [x] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [x] All unit tests pass, and I have added new tests where possible
- [x] I didn't break anyone 😄

Author: eavanvalkenburg

python/samples/concepts/README.md

@@ -172,10 +172,7 @@
 
 ### Search - Using [`Search`](https://github.com/microsoft/semantic-kernel/tree/main/python/semantic_kernel/connectors/search) services information
 
-- [Bing Search Plugin](./search/bing_search_plugin.py)
-- [Bing Text Search](./search/bing_text_search.py)
 - [Bing Text Search as Plugin](./search/bing_text_search_as_plugin.py)
-- [Google Search Plugin](./search/google_search_plugin.py)
 - [Google Text Search as Plugin](./search/google_text_search_as_plugin.py)
 
 ### Service Selector - Shows how to create and use a custom service selector class

python/samples/concepts/search/bing_plugin_examples.py

@@ -1,19 +1,16 @@
 # Copyright (c) Microsoft. All rights reserved.
 
-
-from collections.abc import Coroutine
-from typing import Any
+from collections.abc import Awaitable, Callable
 
 from semantic_kernel import Kernel
-from semantic_kernel.connectors.ai.function_choice_behavior import FunctionChoiceBehavior
+from semantic_kernel.connectors.ai import FunctionChoiceBehavior
 from semantic_kernel.connectors.ai.open_ai import (
     OpenAIChatCompletion,
     OpenAIChatPromptExecutionSettings,
 )
 from semantic_kernel.connectors.search.bing import BingSearch
 from semantic_kernel.contents import ChatHistory
-from semantic_kernel.filters.filter_types import FilterTypes
-from semantic_kernel.filters.functions.function_invocation_context import FunctionInvocationContext
+from semantic_kernel.filters import FilterTypes, FunctionInvocationContext
 from semantic_kernel.functions import KernelArguments, KernelParameterMetadata, KernelPlugin
 
 kernel = Kernel()
@@ -84,7 +81,9 @@
 
 
 @kernel.filter(filter_type=FilterTypes.FUNCTION_INVOCATION)
-async def log_bing_filter(context: FunctionInvocationContext, next: Coroutine[FunctionInvocationContext, Any, None]):
+async def log_bing_filter(
+    context: FunctionInvocationContext, next: Callable[[FunctionInvocationContext], Awaitable[None]]
+):
     if context.function.plugin_name == "bing":
         print("Calling Bing search with arguments:")
         if "query" in context.arguments:

python/samples/concepts/search/bing_search_plugin.py

@@ -5,15 +5,14 @@
 from typing import Any
 
 from semantic_kernel import Kernel
-from semantic_kernel.connectors.ai.function_choice_behavior import FunctionChoiceBehavior
+from semantic_kernel.connectors.ai import FunctionChoiceBehavior
 from semantic_kernel.connectors.ai.open_ai import (
     OpenAIChatCompletion,
     OpenAIChatPromptExecutionSettings,
 )
 from semantic_kernel.connectors.search.google import GoogleSearch
 from semantic_kernel.contents import ChatHistory
-from semantic_kernel.filters.filter_types import FilterTypes
-from semantic_kernel.filters.functions.function_invocation_context import FunctionInvocationContext
+from semantic_kernel.filters import FilterTypes, FunctionInvocationContext
 from semantic_kernel.functions import KernelArguments, KernelParameterMetadata, KernelPlugin
 
 # This sample shows how to setup Google Search as a plugin in the Semantic Kernel.

python/samples/concepts/search/bing_text_search.py

@@ -46,7 +46,6 @@
 from samples.concepts.prompt_templates.load_yaml_prompt import main as load_yaml_prompt
 from samples.concepts.prompt_templates.template_language import main as template_language
 from samples.concepts.rag.rag_with_text_memory_plugin import main as rag_with_text_memory_plugin
-from samples.concepts.search.bing_search_plugin import main as bing_search_plugin
 from samples.concepts.service_selector.custom_service_selector import main as custom_service_selector
 from samples.concepts.text_completion.text_completion import main as text_completion
 from samples.getting_started_with_agents.chat_completion.step1_chat_completion_agent_simple import (
@@ -249,12 +248,6 @@
         marks=pytest.mark.skipif(os.getenv(MEMORY_CONCEPT_SAMPLE, None) is None, reason="Not running memory samples."),
     ),
     param(rag_with_text_memory_plugin, [], id="rag_with_text_memory_plugin"),
-    param(
-        bing_search_plugin,
-        [],
-        id="bing_search_plugin",
-        marks=pytest.mark.skip(reason="Flaky test due to Azure OpenAI content policy"),
-    ),
     param(
         custom_service_selector,
         [],