Update change message to be less redundant and verbose (#1506)

This is based on Dylan's feedback after the first round.

Fixes ENG-363

GitOrigin-RevId: b7cb44524d46361d72f978e47761a9e3b5e1a1f0

Author: DavidS-ovm

sdp-go/util.go

@@ -163,7 +163,7 @@ func RenderItemDiff(gun string, before, after map[string]any, changeData, rawDat
 			slices.Sort(v)
 
 			if len(v) > 0 {
-				para = append(para, fmt.Sprintf("# → 🔁 The '%v' attribute has changed %d times in the last 30 days. The previous values were %v.", k, len(v), v))
+				para = append(para, fmt.Sprintf("# → 🔁 This attribute has changed %d times in the last 30 days.\n#      The previous values were %v.", len(v), v))
 			}
 		}
 	}

sdp-go/util_test.go

@@ -143,7 +143,7 @@ func TestItemDiffParagraphRendering(t *testing.T) {
 					Value: "user",
 				},
 			},
-			ExpectedDiffParagraph: "- name.last: user\n+ name.last: updated\n# → 🔁 The 'testGun.name.last' attribute has changed 1 times in the last 30 days. The previous values were [user].",
+			ExpectedDiffParagraph: "- name.last: user\n+ name.last: updated\n# → 🔁 This attribute has changed 1 times in the last 30 days.\n#      The previous values were [user].",
 		},
 		{
 			Name: "with stats, no changes",