[stable/prometheus-operator]: add EnableAdminAPI option

[amine7536]

Signed-off-by: Amine Benseddik amine@qonto.eu

What this PR does / why we need it:

Adds the option the enable Prometheus TSDB admin api. (--web.enable-admin-api)

Special notes for your reviewer:

This option exists in prometheus-operator prometheusSpec but not in the chart : https://prometheus.io/docs/prometheus/latest/querying/api/#tsdb-admin-apis
https://github.com/coreos/prometheus-operator/blob/master/pkg/prometheus/statefulset.go#L401

Prometheus documentation : https://prometheus.io/docs/prometheus/latest/querying/api/#tsdb-admin-apis

Checklist

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

• [ x ] DCO signed
• [ x ] Chart Version bumped
• [ x ] Variables are documented in the README.md
• [ x ] title of the PR contains starts with chart name e.g. [stable/chart]

[k8s-ci-robot]

Hi @amine7536. 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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[vsliouniaev]

/ok-to-test
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: amine7536, vsliouniaev

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