chore: remove opentsdb addr

[confoc]

In the new version, OpentsdbAddr is not used.
So,I delete the OpentsdbAddr in order to run gtctl correctly

[daviderli614]

@confoc Delete here: https://github.com/GreptimeTeam/gtctl/blob/develop/pkg/helm/testdata/db-manifests.yaml#L36

[zyy17]

@daviderli614 After the PR is merged, we need to release the new version.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.01%. Comparing base (9c7c9fa) to head (a893265).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #203      +/-   ##
===========================================
+ Coverage    40.96%   41.01%   +0.04%     
===========================================
  Files           16       16              
  Lines          991      990       -1     
===========================================
  Hits           406      406              
+ Misses         480      479       -1     
  Partials       105      105              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[daviderli614]

LGTM

[zyy17]

Thank you for your first PR in Greptime🎉