fix: add missing imports (open-telemetry#12908)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description

Adds the missing dependencies into the auto generated files.

<!-- Issue number if applicable -->
#### Link to tracking issue
Fixes #
open-telemetry#12907

<!--Describe what testing was performed and which tests were added.-->
#### Testing

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#### Documentation

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Author: rogercoll

.chloggen/fix_generated_logs_import.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: 'bug_fix'
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: mdatagen
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add time and plog package imports
+
+# One or more tracking issues or pull requests related to the change
+issues: [12907]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

cmd/mdatagen/internal/templates/logs_test.go.tmpl

@@ -3,13 +3,15 @@
 package {{ .Package }}
 
 import (
+	"time"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
 	"go.uber.org/zap"
 	"go.uber.org/zap/zaptest/observer"
 
     "go.opentelemetry.io/collector/pdata/pcommon"
+    "go.opentelemetry.io/collector/pdata/plog"
     {{- if or isReceiver isScraper }}
     "go.opentelemetry.io/collector/{{ .Status.Class }}/{{ .Status.Class }}test"
     {{- end }}