[dagster-aws] delete dummy Pipes classes (#23441)

## Summary & Motivation

Deleting dummy Pipes classes from AWS Pipes. These classes didn't
provide any functionality and their introduction was questionable from
the start.

Context:
-
#23353 (comment)
- #22968

I decided to keep `PipesGlueLambdaEventContextInjector`, because unlike
the the other classes, it's actually used for a unique purpose:
injecting variables into Lambda event input (it might be a bit confusing
because it inherits from `PipesEnvContextInjector` but doesn't actually
do anything with environment variables).

@schrockn let me know if you think if it makes sense 

## How I Tested These Changes

Nothing was really using these classes

docs/content/concepts/dagster-pipes/aws-glue.mdx

@@ -107,8 +107,7 @@ Next, add the `PipesGlueClient` resource to your project's <PyObject object="Def
 
 ```python file=/guides/dagster/dagster_pipes/glue/dagster_code.py startafter=start_definitions_marker endbefore=end_definitions_marker
 from dagster import Definitions  # noqa
-from dagster_aws.pipes import PipesGlueContextInjector, PipesS3MessageReader
-
+from dagster_aws.pipes import PipesS3ContextInjector, PipesS3MessageReader
 
 bucket = os.environ["DAGSTER_GLUE_S3_CONTEXT_BUCKET"]
 
@@ -118,7 +117,7 @@ defs = Definitions(
     resources={
         "pipes_glue_client": PipesGlueClient(
             client=boto3.client("glue"),
-            context_injector=PipesGlueContextInjector(
+            context_injector=PipesS3ContextInjector(
                 client=boto3.client("s3"),
                 bucket=bucket,
             ),

examples/docs_snippets/docs_snippets/guides/dagster/dagster_pipes/glue/dagster_code.py

@@ -24,8 +24,7 @@ def glue_pipes_asset(
 # start_definitions_marker
 
 from dagster import Definitions  # noqa
-from dagster_aws.pipes import PipesGlueContextInjector, PipesS3MessageReader
-
+from dagster_aws.pipes import PipesS3ContextInjector, PipesS3MessageReader
 
 bucket = os.environ["DAGSTER_GLUE_S3_CONTEXT_BUCKET"]
 
@@ -35,7 +34,7 @@ def glue_pipes_asset(
     resources={
         "pipes_glue_client": PipesGlueClient(
             client=boto3.client("glue"),
-            context_injector=PipesGlueContextInjector(
+            context_injector=PipesS3ContextInjector(
                 client=boto3.client("s3"),
                 bucket=bucket,
             ),

python_modules/libraries/dagster-aws/dagster_aws/pipes.py

@@ -334,24 +334,15 @@ def run(
         return PipesClientCompletedInvocation(session)
 
 
-class PipesGlueContextInjector(PipesS3ContextInjector):
-    def no_messages_debug_text(self) -> str:
-        return "Attempted to inject context via Glue job Arguments"
-
-
-class PipesGlueLogsMessageReader(PipesCloudWatchMessageReader):
-    pass
-
-
 @experimental
 class PipesGlueClient(PipesClient, TreatAsResourceParam):
     """A pipes client for invoking AWS Glue jobs.
 
     Args:
         context_injector (Optional[PipesContextInjector]): A context injector to use to inject
-            context into the Glue job, for example, :py:class:`PipesGlueContextInjector`.
+            context into the Glue job, for example, :py:class:`PipesS3ContextInjector`.
         message_reader (Optional[PipesMessageReader]): A message reader to use to read messages
-            from the glue job run. Defaults to :py:class:`PipesGlueLogsMessageReader`.
+            from the glue job run. Defaults to :py:class:`PipesCloudWatchsMessageReader`.
         client (Optional[boto3.client]): The boto Glue client used to launch the Glue job
     """
 
@@ -363,7 +354,7 @@ def __init__(
     ):
         self._client = client or boto3.client("glue")
         self._context_injector = context_injector
-        self._message_reader = message_reader or PipesGlueLogsMessageReader()
+        self._message_reader = message_reader or PipesCloudWatchMessageReader()
 
     @classmethod
     def _is_dagster_maintained(cls) -> bool: