feat: add vpn connection authentication test

Author: huiii99

src/azure-cli/azure/cli/command_modules/network/tests/latest/VpnGatewayAuthCert.cer

@@ -0,0 +1,19 @@
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+-----END CERTIFICATE-----

src/azure-cli/azure/cli/command_modules/network/tests/latest/VpnGatewayInboundCert.cer

@@ -0,0 +1,20 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----