aws-backup: add page (#9369)

* aws-backup: page added

* aws-backup: checks fixed

* aws-backup: checks fix

* Apply suggestions from code review as submitter failed to address them

pages/common/aws-backup.md

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+# aws backup
+
+> Unified backup service designed to protect Amazon Web Services services and their associated data.
+> More information: <https://docs.aws.amazon.com/cli/latest/reference/backup/index.html>.
+
+- Return BackupPlan details for a specific BackupPlanId:
+
+`aws backup get-backup-plan --backup-plan-id {{id}}`
+
+- Create a backup plan using a specific backup plan name and backup rules:
+
+`aws backup create-backup-plan --backup-plan {{plan}}`
+
+- Delete a specific backup plan:
+
+`aws backup delete-backup-plan --backup-plan-id {{id}}`
+
+- Return a list of all active backup plans for the current account:
+
+`aws backup list-backup-plans`
+
+- Display details about your report jobs:
+
+`aws backup list-report-jobs`