[pdata/pprofile] remove field Profile.StartTime from pdata/pprofile (#13315)

When working with pdata/pprofile I noticed, there is no field named
StartTime in message Profile of the OTel Profiling signal in version
v1.7.0 - see
https://github.com/open-telemetry/opentelemetry-proto/blob/v1.7.0/opentelemetry/proto/profiles/v1development/profiles.proto.
I also reordered the fields according to the OTel Profiling signal
specification.

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---------

Signed-off-by: Florian Lehner <[email protected]>

Author: florianl

.chloggen/pprofile-align-signal.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: breaking
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: pdata/pprofile
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Remove field Profile.StartTime from pdata/pprofile 
+
+# One or more tracking issues or pull requests related to the change
+issues: [13315]
+
+# (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: Remove Profile.StartTime from OTel Profiling signal.
+
+# 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: [api]

pdata/internal/cmd/pdatagen/internal/pprofile_package.go

@@ -171,17 +171,6 @@ var profile = &messageValueStruct{
 				testVal:     "1234567890",
 			},
 		},
-		&primitiveTypedField{
-			fieldName:       "StartTime",
-			originFieldName: "TimeNanos",
-			returnType: &primitiveType{
-				structName:  "Timestamp",
-				packageName: "pcommon",
-				rawType:     "int64",
-				defaultVal:  "0",
-				testVal:     "1234567890",
-			},
-		},
 		&messageValueField{
 			fieldName:     "PeriodType",
 			returnMessage: valueType,
@@ -212,10 +201,6 @@ var profile = &messageValueStruct{
 				testVal:    "data.ProfileID([16]byte{1, 2, 3, 4, 5, 6, 7, 8, 8, 7, 6, 5, 4, 3, 2, 1})",
 			},
 		},
-		&sliceField{
-			fieldName:   "AttributeIndices",
-			returnSlice: int32Slice,
-		},
 		droppedAttributesCount,
 		&primitiveField{
 			fieldName:  "OriginalPayloadFormat",
@@ -227,6 +212,10 @@ var profile = &messageValueStruct{
 			fieldName:   "OriginalPayload",
 			returnSlice: byteSlice,
 		},
+		&sliceField{
+			fieldName:   "AttributeIndices",
+			returnSlice: int32Slice,
+		},
 	},
 }