[AI-4451] Add Milvus integration (#19055)

* Add Milvus skeleton

* Add metrics to metadata.csv

* Add periods in metadata.csv

* Update spec

* Update config models

* Update manifest

* Update check.py

* Add process signature

* Add units in metadata.csv

* Remove process signature

* Add payload fixture

* Add tests

* Fix metadata.csv

* Add non-Milvus specific metrics

* Update metrics map

* Expand histogram metrics

* Fix metrics mapping and divide test metrics

* Passing unit tests

* Add e2e env and test

* Run lint

* Fix CI

* Switch to deprecated classifier tags for CI

* Sync labeler

* Remove dashboard and add metric check

* Implement review suggestions

* Incorporate documentation suggestions

* Capitalize unix in metadata description

Co-authored-by: Ursula Chen <58821586+urseberry@users.noreply.github.com>

* Incorporate documentation suggestions

* Move metrics out of standalone test

* Fix unit tests

* Improve README

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Co-authored-by: Ursula Chen <58821586+urseberry@users.noreply.github.com> 1cb058e