[bitnami/thanos] addition of parameter to configure statefulset annotations

[TomHellier]

Description of the change

Adds annotations to thanos receive statefulset

Benefits

Greater configurability

Possible drawbacks

n/a

Applicable issues

• fixes #33987

Additional information

Checklist

• [x] Chart version bumped in Chart.yaml according to semver. This is not necessary when the changes only affect README.md files.
• [x] Variables are documented in the values.yaml and added to the README.md using readme-generator-for-helm
• [x] Title of the pull request follows this pattern [bitnami/<name_of_the_chart>] Descriptive title
• [x] All commits signed off and in agreement of Developer Certificate of Origin (DCO)