[incubator/druid] Add securityContext and fix local storage mounting path

[AWaterColorPen]

Is this a new chart

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What this PR does / why we need it:

• add securityContext to Historical and MiddleManager statefulSet
• set default securityContext.fsGroup=1000 in values.yaml, which is the default id of the druid container user druid.
• change Historical and MiddleManager node's mount volume path from /var/druid/ to /opt/druid/var/druid/, which is the default path to store stateful files.

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)

• fixes [incubator/druid] fails with containerd 1.12.3 -- mkdir: can't create directory 'var/[tmp,druid]': Permission denied #23373

Special notes for your reviewer:

base on #23069 and #23121 PRs, but they blocked.

Checklist

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

• DCO signed
• Chart Version bumped
• Variables are documented in the README.md
• Title of the PR starts with chart name (e.g. [stable/mychartname])

[k8s-ci-robot]

Hi @AWaterColorPen. Thanks for your PR.

I'm waiting for a helm member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[AWaterColorPen]

/assign @maver1ck
please help for a review

[AWaterColorPen]

@sameersbn
could you help for a /ok-to-test

[maver1ck]

/ok-to-test

[AWaterColorPen]

/lgtm

[k8s-ci-robot]

@AWaterColorPen: you cannot LGTM your own PR.

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/lgtm

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[AWaterColorPen]

@maver1ck could you help for a /lgtm

[maver1ck]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AWaterColorPen, maver1ck

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• incubator/druid/OWNERS [AWaterColorPen,maver1ck]

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