[chore] testbed: fix k8s log datasenders (open-telemetry#30301)

**Description:**
Fixing a bug - These changes correct the k8s datasender filelog receiver
entries to use the correct field since parsers now `parse_to` attributes
instead of body. Without these corrections the agent logs are flooded
with errors and I wasn't able to have the tests pass locally without
bumping up the implicit `tc.WaitFor()` time (not really sure how the
runners are fairing so well tbh).

**Documentation:**
none needed

testbed/datasenders/k8s.go

@@ -175,7 +175,7 @@ func NewKubernetesContainerWriter() *FileLogK8sWriter {
         regex: '^(?P<time>[^ Z]+) (?P<stream>stdout|stderr) (?P<logtag>[^ ]*) (?P<log>.*)$'
         output: extract_metadata_from_filepath
         timestamp:
-          parse_from: body.time
+          parse_from: attributes.time
           layout_type: gotime
           layout: '2006-01-02T15:04:05.000000000-07:00'
       # Parse CRI-Containerd format
@@ -184,42 +184,42 @@ func NewKubernetesContainerWriter() *FileLogK8sWriter {
         regex: '^(?P<time>[^ ^Z]+Z) (?P<stream>stdout|stderr) (?P<logtag>[^ ]*) (?P<log>.*)$'
         output: extract_metadata_from_filepath
         timestamp:
-          parse_from: body.time
+          parse_from: attributes.time
           layout: '%%Y-%%m-%%dT%%H:%%M:%%S.%%LZ'
       # Parse Docker format
       - type: json_parser
         id: parser-docker
         output: extract_metadata_from_filepath
         timestamp:
-          parse_from: body.time
+          parse_from: attributes.time
           layout: '%%Y-%%m-%%dT%%H:%%M:%%S.%%LZ'
+      - type: move
+        from: attributes.log
+        to: body
       # Extract metadata from file path
       - type: regex_parser
         id: extract_metadata_from_filepath
         regex: '^.*\/(?P<namespace>[^_]+)_(?P<pod_name>[^_]+)_(?P<uid>[a-f0-9\-]{36})\/(?P<container_name>[^\._]+)\/(?P<restart_count>\d+)\.log$'
         parse_from: attributes["log.file.path"]
       # Move out attributes to Attributes
       - type: move
-        from: body.stream
+        from: attributes.stream
         to: attributes["log.iostream"]
       - type: move
-        from: body.container_name
+        from: attributes.container_name
         to: attributes["k8s.container.name"]
       - type: move
-        from: body.namespace
+        from: attributes.namespace
         to: attributes["k8s.namespace.name"]
       - type: move
-        from: body.pod_name
+        from: attributes.pod_name
         to: attributes["k8s.pod.name"]
       - type: move
-        from: body.restart_count
+        from: attributes.restart_count
         to: attributes["k8s.container.restart_count"]
       - type: move
-        from: body.uid
+        from: attributes.uid
         to: attributes["k8s.pod.uid"]
-      - type: move
-        from: body.log
-        to: body
   `)
 }
 
@@ -239,35 +239,35 @@ func NewKubernetesCRIContainerdWriter() *FileLogK8sWriter {
         regex: '^(?P<time>[^ ^Z]+Z) (?P<stream>stdout|stderr) (?P<logtag>[^ ]*) (?P<log>.*)$'
         output: extract_metadata_from_filepath
         timestamp:
-          parse_from: body.time
+          parse_from: attributes.time
           layout: '%%Y-%%m-%%dT%%H:%%M:%%S.%%LZ'
       # Extract metadata from file path
       - type: regex_parser
         id: extract_metadata_from_filepath
         regex: '^.*\/(?P<namespace>[^_]+)_(?P<pod_name>[^_]+)_(?P<uid>[a-f0-9\-]{36})\/(?P<container_name>[^\._]+)\/(?P<restart_count>\d+)\.log$'
         parse_from: attributes["log.file.path"]
+      - type: move
+        from: attributes.log
+        to: body
       # Move out attributes to Attributes
       - type: move
-        from: body.stream
+        from: attributes.stream
         to: attributes["log.iostream"]
       - type: move
-        from: body.container_name
+        from: attributes.container_name
         to: attributes["k8s.container.name"]
       - type: move
-        from: body.namespace
+        from: attributes.namespace
         to: attributes["k8s.namespace.name"]
       - type: move
-        from: body.pod_name
+        from: attributes.pod_name
         to: attributes["k8s.pod.name"]
       - type: move
-        from: body.restart_count
+        from: attributes.restart_count
         to: attributes["k8s.container.restart_count"]
       - type: move
-        from: body.uid
+        from: attributes.uid
         to: attributes["k8s.pod.uid"]
-      - type: move
-        from: body.log
-        to: body
   `)
 }
 
@@ -287,7 +287,7 @@ func NewKubernetesCRIContainerdNoAttributesOpsWriter() *FileLogK8sWriter {
         regex: '^(?P<time>[^ ^Z]+Z) (?P<stream>stdout|stderr) (?P<logtag>[^ ]*) (?P<log>.*)$'
         output: extract_metadata_from_filepath
         timestamp:
-          parse_from: body.time
+          parse_from: attributes.time
           layout: '%%Y-%%m-%%dT%%H:%%M:%%S.%%LZ'
       # Extract metadata from file path
       - type: regex_parser
@@ -312,7 +312,7 @@ func NewCRIContainerdWriter() *FileLogK8sWriter {
         id: parser-containerd
         regex: '^(?P<time>[^ ^Z]+Z) (?P<stream>stdout|stderr) (?P<logtag>[^ ]*) (?P<log>.*)$'
         timestamp:
-          parse_from: body.time
+          parse_from: attributes.time
           layout: '%%Y-%%m-%%dT%%H:%%M:%%S.%%LZ'
   `)
 }