[chore][receiver/tlscheckreceiver] sort metadata.yaml entries (#43492)

#### Description

Sort metadata.yaml file in preparation for sort validation using
mdatagen. Context:
open-telemetry/opentelemetry-collector#13782

Signed-off-by: Paulo Dias <[email protected]>

Author: paulojmdias

receiver/tlscheckreceiver/metadata.yaml

@@ -15,12 +15,12 @@ resource_attributes:
     type: string
 
 attributes:
-  tlscheck.x509.issuer:
-    description: The entity that issued the certificate.
-    type: string
   tlscheck.x509.cn:
     description: The commonName in the subject of the certificate.
     type: string
+  tlscheck.x509.issuer:
+    description: The entity that issued the certificate.
+    type: string
   tlscheck.x509.san:
     description: The Subject Alternative Name of the certificate.
     type: slice
@@ -34,4 +34,4 @@ metrics:
     gauge:
       value_type: int
     unit: "s"
-    attributes: [tlscheck.x509.issuer, tlscheck.x509.cn, tlscheck.x509.san]
+    attributes: [tlscheck.x509.issuer, tlscheck.x509.cn, tlscheck.x509.san]