变更摘要

本 PR 为构建系统引入 ENABLE_OP_KERNEL 开关，使 --opkernel 单独构建二进制 kernel 的场景不再依赖 ES 包生成流程。build.sh 中新增该变量并在满足「OP_KERNEL 为真、且非打包、非测试」条件时置为 TRUE，再通过 -DENABLE_OP_KERNEL= 透传给 CMake；CMake 侧在依赖查找、add_es_library 与 add_es_library_and_whl 调用及 ES 相关目标链接处增加条件判断，在该开关打开时跳过这些步骤。

主要改动

• 新增 ENABLE_OP_KERNEL 构建开关: build.sh 初始化 ENABLE_OP_KERNEL=FALSE，并在仅 --opkernel 单独构建（非 ENABLE_BUILD_PKG、非 ENABLE_TEST）时置为 TRUE，其余场景保持 FALSE。
• CMake 参数透传: assemble_cmake_args 中新增 -DENABLE_OP_KERNEL=${ENABLE_OP_KERNEL}，将构建开关传递给 CMake 工程。
• 跳过 GenerateEsPackage 查找: cmake/dependencies.cmake 在 BUILD_WITH_INSTALLED_DEPENDENCY_CANN_PKG 分支下用 if(NOT ENABLE_OP_KERNEL) 包裹 find_package(GenerateEsPackage MODULE QUIET) 及其 FATAL_ERROR 检查，开关打开时不再强制要求该包存在。
• 跳过 add_es_library 调用: cmake/custom_build.cmake 中定制 proto 的 add_es_library(... es_transformer_cust ...) 整段被 if(NOT ENABLE_OP_KERNEL) 包裹，单独构建 kernel 时不再生成对应 ES 库与安装规则。
• 跳过 add_es_library_and_whl 与 ES graph 链接: cmake/symbol.cmake 中 gen_es_transformer_lib_builtin 的 add_es_library_and_whl 调用及 gen_opgraph_symbol 内基于 ${GRAPH_PLUGIN_NAME}_obj 的 ES graph 链接逻辑均被 if(NOT ENABLE_OP_KERNEL) 包裹，避免单独构建时触发未就绪的 ES 目标。

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/compile

@xtqh @Allan_Yu @gaoxiang618 @mabing1118 @monologue815 @zzzzzzyf_ @liudan12 @jiang-lirui @wang-minbo
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/approve
/lgtm

/lgtm
/approve