[stable/grafana] Fix release namespacing in dashboards-json-configmap.yaml

[timfpark]

What this PR does / why we need it:

Commit c90d037#diff-bafa6cfa504816afea02a70a6b35f5be from @lwolf broke the grafana chart for me when it is used with a namespace because .Release.Namespace is not operating off of the correct context and needs a $.Release.Namespace per the rest of the variables in this file.

Which issue this PR fixes

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

• fixes #

Special notes for your reviewer:

Checklist

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

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

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: timfpark
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[k8s-ci-robot]

Hi @timfpark. 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[steven-sheehy]

@timfpark Please sign your commits

[maorfr]

@steven-sheehy, want to be added as a grafana maintainer? ;)

[maorfr]

hey @timfpark,

need to sign the DCO...

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Any further update will cause the issue/pull request to no longer be considered stale. Thank you for your contributions.

[stale]

This issue is being automatically closed due to inactivity.