[stable/datadog] Support leader election check on daemonset agent

[clamoriniere]

What this PR does / why we need it:

Which issue this PR fixes

Add RBAC permission to Daemonset Agent to get "endpoints" API server resources for "leader election check" support.

Special notes for your reviewer:

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 contains starts with chart name e.g. [stable/chart]

[clamoriniere]

/assign @mfpierre

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[clamoriniere]

/lgtm

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/lgtm

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[clamoriniere]

/approve

[CharlyF]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CharlyF, clamoriniere

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