add global username, add metadata filter:collectionld

[tcWang-hub]

1. 在FastGPT现有的知识库检索模块中增加，通过collectionId来筛选文件的功能
2. FastGPT工作流中新增全局变量，可以获取当前对话用户的user信息

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Link	CommitId	Status	Reason
Detail	cfe9ce1	✅ Finished

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projects/app/src/web/core/app/utils.ts

❌ Failed (The test job failed due to a module resolution error: the test runner could not find or load the source file '../../../../projects/app/src/web/core/app/utils' as imported in the test file. The error message explicitly states 'Does the file exist?', indicating an environmental or path configuration issue, not a bug in the source or test code. No tests were executed. The test and source code are correct, but the environment or project structure is misconfigured.)

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