Add 'HCI' acronym name transfer rule. (#5263)

Author: ArthurMa1978

src/AutoRest.CSharp/Mgmt/Models/NameTransformer.cs

@@ -43,6 +43,7 @@ public record ApplyDetailStep(string MappingKey, AcronymMappingTarget MappingVal
             { "Ipv6", new AcronymMappingTarget("IPv6", "ipv6") },
             { "Ipsec", new AcronymMappingTarget("IPsec", "ipsec") },
             { "URI", new AcronymMappingTarget("Uri") },
+            { "HCI", new AcronymMappingTarget("Hci") },
             // Need to set parameter value for ETag to "etag" as well
             { "ETag", new AcronymMappingTarget("ETag", "etag") },
             { "Etag", new AcronymMappingTarget("ETag", "etag") },