Revise Prometheus PVC Spec Syntax Error

[krapie]

What this PR does / why we need it:

Revise Prometheus PVC spec syntax error.

I found out that the yorkie-monitoring helm chart was not storing prometheus metrics, which leads to data loss of metrics every time a node goes down (e.g., EC2 spot instance goes down).

This was because the helm chart syntax of volumeClaimTemplate was wrong (it was not linked to storageSpec). Therefore, I corrected the syntax to make Prometheus successfully claim PVC.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Additional documentation:

Checklist:

• Added relevant tests or not required
• Didn't break anything

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (2b431e0) 48.86% compared to head (af75197) 48.86%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #650   +/-   ##
=======================================
  Coverage   48.86%   48.86%           
=======================================
  Files          69       69           
  Lines       10082    10082           
=======================================
  Hits         4927     4927           
  Misses       4635     4635           
  Partials      520      520           

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[hackerwins]

Thanks for your contribution. I left a comment.

[hackerwins]

LGTM