[chore][CODEOWNERS] Remove trailing whitespace (open-telemetry#37293)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description
`githubgen` was adding trailing whitespaces to unmaintained components
that was unnecessary. This removes the trailing whitespaces.

<!-- Issue number (e.g. open-telemetry#1234) or full URL to issue, if applicable. -->
#### Link to tracking issue
Fixes open-telemetry#37292

.github/CODEOWNERS

@@ -318,14 +318,14 @@ testbed/mockdatasenders/mockdatadogagentexporter/                @open-telemetry
 # List of distribution maintainers for OpenTelemetry Collector Contrib
 #
 #####################################################
-reports/distributions/core.yaml    @open-telemetry/collector-contrib-approvers 
-reports/distributions/contrib.yaml @open-telemetry/collector-contrib-approvers 
-reports/distributions/k8s.yaml     @open-telemetry/collector-contrib-approvers 
 
+reports/distributions/core.yaml    @open-telemetry/collector-contrib-approvers
+reports/distributions/contrib.yaml @open-telemetry/collector-contrib-approvers
+reports/distributions/k8s.yaml     @open-telemetry/collector-contrib-approvers
 
 ## UNMAINTAINED components
 
-exporter/kineticaexporter/                                       @open-telemetry/collector-contrib-approvers 
-exporter/opensearchexporter/                                     @open-telemetry/collector-contrib-approvers 
-extension/observer/ecstaskobserver/                              @open-telemetry/collector-contrib-approvers 
-extension/storage/filestorage/                                   @open-telemetry/collector-contrib-approvers 
+exporter/kineticaexporter/                                       @open-telemetry/collector-contrib-approvers
+exporter/opensearchexporter/                                     @open-telemetry/collector-contrib-approvers
+extension/observer/ecstaskobserver/                              @open-telemetry/collector-contrib-approvers
+extension/storage/filestorage/                                   @open-telemetry/collector-contrib-approvers

cmd/githubgen/codeowners.go

@@ -139,7 +139,7 @@ LOOP:
 		for stability := range m.Status.Stability {
 			if stability == unmaintainedStatus {
 				unmaintainedList += key + "/\n"
-				unmaintainedCodeowners += fmt.Sprintf("%s/%s @open-telemetry/collector-contrib-approvers \n", key, strings.Repeat(" ", data.maxLength-len(key)))
+				unmaintainedCodeowners += fmt.Sprintf("%s/%s @open-telemetry/collector-contrib-approvers\n", key, strings.Repeat(" ", data.maxLength-len(key)))
 				continue LOOP
 			}
 			if stability == "deprecated" && (m.Status.Codeowners == nil || len(m.Status.Codeowners.Active) == 0) {
@@ -176,7 +176,13 @@ LOOP:
 		for _, m := range dist.Maintainers {
 			maintainers = append(maintainers, fmt.Sprintf("@%s", m))
 		}
-		codeowners += fmt.Sprintf("reports/distributions/%s.yaml%s @open-telemetry/collector-contrib-approvers %s\n", dist.Name, strings.Repeat(" ", longestName-len(dist.Name)), strings.Join(maintainers, " "))
+
+		distribution := fmt.Sprintf("\nreports/distributions/%s.yaml%s @open-telemetry/collector-contrib-approvers", dist.Name, strings.Repeat(" ", longestName-len(dist.Name)))
+		if len(maintainers) > 0 {
+			distribution += fmt.Sprintf(" %s", strings.Join(maintainers, " "))
+		}
+
+		codeowners += distribution
 	}
 
 	err = os.WriteFile(filepath.Join(".github", "CODEOWNERS"), []byte(codeowners+unmaintainedCodeowners), 0o600)