fix: change milvus init args from (host, port) to (url, token)

[zc277584121]

It's recommand to use URI and token in Milvus setting, instead of HOST, PORT. Here is an example to teach how to use URI and token in both Milvus and Zilliz: https://milvus.io/docs/build-rag-with-milvus.md#Load-data-into-Milvus
The ( HOST, PORT) appoach is about to depracate in the future, and it will bring confusion to the users.

In this PR, I changed the default setting from (host, port) to (uri , token), and depracated the unecessary milvus_secure. There was some duplicate code in the milvus_vector.py, and I refactor them using milvusClient, which made it more consice.

Checklist:

Important

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• Please open an issue before creating a PR or link to an existing issue:
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

Description

Describe the big picture of your changes here to communicate to the maintainers why we should accept this pull request. If it fixes a bug or resolves a feature request, be sure to link to that issue. Close issue syntax: Fixes #<issue number>, see documentation for more details.

Close #8017

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update, included: Dify Document
• Improvement, including but not limited to code refactoring, performance optimization, and UI/UX improvement
• Dependency upgrade

Testing Instructions

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Have end2end tested with milvus

[crazywoola]

Please update the docs here as well https://github.com/langgenius/dify-docs. All languages are required. :) Thanks. @zc277584121

[zc277584121]

langgenius/dify-docs#252
@crazywoola please reivew

[Seayon]

This is a breaking change. Users who are still using the MILVUS_HOST and MILVUS_PORT configuration will be unable to start their servers after this update. Would you consider optimizing this change or adding some documentation to guide users through the transition?

[crazywoola]

Please add my wechat crazyphage @zc277584121