mgmt, imagebuilder, rename java method validate (#19248)

* mgmt, imagebuilder, rename java method validate

* move java specific configurations to readme.java.md

* remove outdated configs

Author: XiaofeiCao

specification/imagebuilder/resource-manager/readme.java.md

@@ -0,0 +1,12 @@
+## Java
+
+These settings apply only when `--java` is specified on the command line.
+
+``` yaml $(java)
+directive:
+  - from: imagebuilder.json
+    where: $.definitions.ImageTemplateProperties.properties.validate
+    transform: >
+      $["x-ms-client-name"] = "validation";
+    reason: property name validate collides with built-in method name
+```

specification/imagebuilder/resource-manager/readme.md

@@ -115,47 +115,4 @@ See configuration in [readme.go.md](./readme.go.md)
 
 ## Java
 
-These settings apply only when `--java` is specified on the command line.
-Please also specify `--azure-libraries-for-java-folder=<path to the root directory of your azure-libraries-for-java clone>`.
-
-``` yaml $(java)
-azure-arm: true
-fluent: true
-namespace: com.microsoft.azure.management.imagebuilder
-license-header: MICROSOFT_MIT_NO_CODEGEN
-payload-flattening-threshold: 1
-output-folder: $(azure-libraries-for-java-folder)/azure-mgmt-imagebuilder
-```
-
-### Java multi-api
-
-``` yaml $(java) && $(multiapi)
-batch:
-  - tag: package-2019-02
-```
-
-### Tag: package-2018-02 and java
-
-These settings apply only when `--tag=package-2018-02 --java` is specified on the command line.
-Please also specify `--azure-libraries-for-java=<path to the root directory of your azure-sdk-for-java clone>`.
-
-``` yaml $(tag) == 'package-2018-02' && $(java) && $(multiapi)
-java:
-  namespace: com.microsoft.azure.management.imagebuilder.v2018_02_01_preview
-  output-folder: $(azure-libraries-for-java-folder)/sdk/imagebuilder/mgmt-v2018_02_01_preview
-regenerate-manager: true
-generate-interface: true
-```
-
-### Tag: package-2019-02 and java
-
-These settings apply only when `--tag=package-2019-02 --java` is specified on the command line.
-Please also specify `--azure-libraries-for-java=<path to the root directory of your azure-sdk-for-java clone>`.
-
-``` yaml $(tag) == 'package-2019-02' && $(java) && $(multiapi)
-java:
-  namespace: com.microsoft.azure.management.imagebuilder.v2019_02_01_preview
-  output-folder: $(azure-libraries-for-java-folder)/sdk/imagebuilder/mgmt-v2019_02_01_preview
-regenerate-manager: true
-generate-interface: true
-```
+See configuration in [readme.java.md](./readme.java.md)