[milvus-4.1.18] Enhancement: Configurable User limit settings for Milvus

[Rachit-Chaudhary11]

Author - @Rachit-Chaudhary11

What this PR does / why we need it:

This update will allow for better scalability and flexibility in managing the users access to milvus instance. Presently this limit is set to 100 users per milvus instance and there is no way to increase / decrease the users limit to milvus instance.

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• Chart Version bumped
• Variables are documented in the README.md
• Title of the PR starts with chart name (e.g. [mychartname])
• PR only contains changes for one chart

[Rachit-Chaudhary11]

/assign @zwd1208
Please validate the pull request.

[haorenfsa]

@Rachit-Chaudhary11 Please also sign-off this commit. And you may also need to rebase after the last PR is merged, and make sure the Chart Version is bumped.
same as I mentioned in #61 (comment)

[haorenfsa]

/lgtm

[haorenfsa]

@Rachit-Chaudhary11 We bump the chart version in every PR.
So please rebase master branch again, and bump the chart version to 4.1.21. Thank you very much.

[Rachit-Chaudhary11]

@haorenfsa please check, I have bumped up the milvus chart version

[Rachit-Chaudhary11]

/assign @zwd1208
@haorenfsa Please validate the pull request.

[haorenfsa]

/lgtm

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