ref(preprod): Remove onboarding messages from snapshot PR comments

Remove first-upload and missing-base onboarding messages to match the
size analysis pattern, which doesn't have these Emerge-specific flows.

Author: runningcode

src/sentry/preprod/vcs/pr_comments/snapshot_templates.py

@@ -84,8 +84,6 @@ def format_snapshot_pr_comment(
 def format_snapshot_pr_comment_solo(
     artifacts: list[PreprodArtifact],
     snapshot_metrics_map: dict[int, PreprodSnapshotMetrics],
-    is_first_upload: bool = False,
-    is_missing_base: bool = False,
 ) -> str:
     """Format a PR comment for snapshots without a base comparison."""
     if not artifacts:
@@ -107,29 +105,7 @@ def format_snapshot_pr_comment_solo(
 
     table_header = "| Name | Snapshots | Status |\n| :--- | :---: | :---: |\n"
 
-    sections = [_HEADER, table_header + "\n".join(table_rows)]
-
-    if is_first_upload:
-        sections.append(
-            str(
-                _(
-                    "This looks like your first snapshot upload. "
-                    "Snapshot diffs will appear when we have a base upload to compare against. "
-                    "Make sure to upload snapshots from your main branch."
-                )
-            )
-        )
-    elif is_missing_base:
-        sections.append(
-            str(
-                _(
-                    "No base snapshots found to compare against. "
-                    "Make sure snapshots are uploaded from your main branch."
-                )
-            )
-        )
-
-    return "\n\n".join(sections)
+    return f"{_HEADER}\n\n{table_header}" + "\n".join(table_rows)
 
 
 def _name_cell(

tests/sentry/preprod/vcs/pr_comments/test_snapshot_templates.py

@@ -356,34 +356,6 @@ def test_solo_upload(self) -> None:
         assert "| 15 |" in result
         assert "Uploaded" in result
 
-    def test_first_upload_shows_onboarding(self) -> None:
-        artifact, metrics = self._create_artifact_with_metrics()
-
-        result = format_snapshot_pr_comment_solo(
-            [artifact], {artifact.id: metrics}, is_first_upload=True
-        )
-
-        assert "first snapshot upload" in result
-        assert "main branch" in result
-
-    def test_missing_base_shows_warning(self) -> None:
-        artifact, metrics = self._create_artifact_with_metrics()
-
-        result = format_snapshot_pr_comment_solo(
-            [artifact], {artifact.id: metrics}, is_missing_base=True
-        )
-
-        assert "No base snapshots found" in result
-        assert "main branch" in result
-
-    def test_solo_no_warnings(self) -> None:
-        artifact, metrics = self._create_artifact_with_metrics()
-
-        result = format_snapshot_pr_comment_solo([artifact], {artifact.id: metrics})
-
-        assert "first snapshot upload" not in result
-        assert "No base snapshots found" not in result
-
     def test_solo_no_metrics_shows_processing(self) -> None:
         artifact = self.create_preprod_artifact(
             project=self.project,