[KeyVault] Fixed import key from encrypted certificate in Add-AzKeyVaultKey (#20239)

* wip

* pfxWebKeyConverter

* Fixed certificate export parameter issue in Add-AzKeyVaultKey

* polish

* polish

* polish

Author: BethanyZhou

src/KeyVault/KeyVault.Test/PesterTests/Key.Tests.ps1

@@ -45,6 +45,10 @@ Describe "Update key" {
 }
 
 Describe "Import key" {
+    It "Import a RSA key from pfx certificate"{ 
+        Add-AzKeyVaultKey -VaultName bez-kv1123 -KeyName bez-key1123 -KeyFilePath "$PSScriptRoot\..\Resources\importkeytest.pfx" -KeyFilePassword (ConvertTo-SecureString 123456 -AsPlainText -Force)
+    }
+    
     It "should throw when key type EC and curve name are not paired" {
         {
             Add-AzKeyVaultKey -VaultName veakkine-kv -Name PSECImportedKey -KeyFilePath E:\targetBlob.byok -KeyType EC -ErrorAction Stop

src/KeyVault/KeyVault.Test/Resources/importkeytest.pfx

@@ -18,6 +18,7 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* Fixed certificate export parameter issue in `Add-AzKeyVaultKey` [#19623]
 * Fixed CertificateString decoding issue in `Import-AzKeyVaultCertificate`
 * Shifted the location of key CVM release policy to GitHub [#19984]
 * Added fallback logic (reading default CVM policy from a local copy) if fetching default CVM Policy from GitHub failed.