force:source:manifest:create --fromorg creates manifest with missing namespace on CMT records and layouts

### Summary

When using force:source:manifest:create --fromorg, namespace is missing on managed Custom Metadata Type records and Layouts
Side effect: If there are two CMT records with same developername but different QualifiedApiName (one managed and other unmanaged), only one is present in package.xml

### Steps To Reproduce:

Step 1: Install any managed package with public (not protected) Custom Metadata Type record and managed Layout
Step 2: Run ```sfdx force:source:manifest:create --fromorg org_alias -n package.xml -c managed```

### Expected result

```

namespace__Object.namespace__Layout
Layout

namespace__Object.namespace__Record
CustomMetadata

```

### Actual result

```

namespace__Object.Layout
Layout

namespace__Object.Record
CustomMetadata

```

### System Information

Tried in bash and cmd.

sfdx-cli/7.166.1 win32-x64 node-v16.15.1