[AppService]: fix #14790- updated Import-AzWebAppKeyVaultCertificate1 to set the default name with combination of keyvault name and cert name (#15937)

* Updated changelog.md

* fix #14790- updated `Import-AzWebAppKeyVaultCertificate1` to set the default name with combination of keyvault name and cert name

* Update ChangeLog.md

Co-authored-by: Yunchi Wang <[email protected]>

Author: Kotasudhakarreddy

src/Websites/Websites.Test/ScenarioTests/CertificatesTests.ps1

@@ -155,6 +155,9 @@ function Test-ImportAzWebAppKeyVaultCertificate
 	{		
 		#Setup
 		$kvcert = Import-AzWebAppKeyVaultCertificate -ResourceGroupName $rgname -WebAppName $wname -KeyVaultName $keyvaultname -CertName $keyvaultcertname
+		$default_webapp_certname= $keyvaultname+'-'+$keyvaultcertname
+		# Assert
+		Assert-AreEqual $kvcert.Name $default_webapp_certname	
 
 	}
 	finally{