fix: address Copilot review on coalesce warnings

- add missing 'warning:' prefix and terminal period to globals key message
- simplify overly verbose 'skipped value' message (remove YAML-specific wording)
- shorten test assertions to stable key-path fragments

Signed-off-by: Marcus H <jfjrh2014@users.noreply.github.com>

pkg/chart/common/util/coalesce.go

@@ -180,7 +180,7 @@ func coalesceGlobals(printf printFn, dest, src map[string]any, prefix string, _
 			}
 		} else if dv, ok := dg[key]; ok && istable(dv) {
 			// It's not clear if this condition can actually ever trigger.
-			printf("key %s is a mapping. Skipping", key)
+			printf("warning: key %s is a mapping. Skipping.", key)
 		} else {
 			// TODO: Do we need to do any additional checking on the value?
 			dg[key] = val
@@ -245,7 +245,7 @@ func coalesceValues(printf printFn, c chart.Charter, v map[string]any, prefix st
 					// If the original value is nil, there is nothing to coalesce, so we don't print
 					// the warning
 					if val != nil {
-						printf("warning: skipped value for %s.%s: destination is a mapping, but the provided value is not. Use a YAML map (key:value pairs) for this key.", subPrefix, key)
+						printf("warning: skipped value for %s.%s: destination is a mapping, but the provided value is not.", subPrefix, key)
 					}
 				} else {
 					// If the key is a child chart, coalesce tables with Merge set to true

pkg/chart/common/util/coalesce_test.go

@@ -720,9 +720,9 @@ func TestCoalesceValuesWarnings(t *testing.T) {
 	}
 
 	t.Logf("vals: %v", vals)
-	assert.Contains(t, warnings, "warning: skipped value for level1.level2.level3.boat: destination is a mapping, but the provided value is not. Use a YAML map (key:value pairs) for this key.")
-	assert.Contains(t, warnings, "warning: destination for level1.level2.level3.spear.tip is a mapping. Ignoring non-mapping value (true)")
-	assert.Contains(t, warnings, "warning: cannot overwrite mapping with non-mapping value for level1.level2.level3.spear.sail (map[cotton:true])")
+	assert.Contains(t, warnings, "skipped value for level1.level2.level3.boat")
+	assert.Contains(t, warnings, "destination for level1.level2.level3.spear.tip is a mapping")
+	assert.Contains(t, warnings, "cannot overwrite mapping with non-mapping value for level1.level2.level3.spear.sail")
 }
 
 func TestConcatPrefix(t *testing.T) {