add namespace metadata

[mchtech]

What this PR does / why we need it:

metadata.namespace is missing in some templates.

this is needed for when helm is used purely as a templating tool,
since helm template does not add the namespace
helm/helm#3553

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

[sre-ci-robot]

Welcome @mchtech! It looks like this is your first PR to zilliztech/milvus-helm 🎉

[haorenfsa]

Hi @mchtech, sry for the delay. Please also bump the version before we could merge it.

[mchtech]

Hi @mchtech, sry for the delay. Please also bump the version before we could merge it.

branch synced.

[haorenfsa]

@mchtech, sry I missed last version. Please bump the version again. Thank you very much for your patience!

[haorenfsa]

/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: haorenfsa, mchtech

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[mchtech]

@mchtech, sry I missed last version. Please bump the version again. Thank you very much for your patience!

branch synced.

[haorenfsa]

/lgtm