fix: [2.4] fill the metric type field in the LoadMetaInfo object

[SimFG]

• issue: [Bug]: Fail to search when upgrading the server from 2.3.x to 2.4.x #35960
• pr: fix: fill the metric type field in the LoadMetaInfo object #35962

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: czs007, SimFG

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• internal/core/OWNERS [czs007]
• internal/querycoordv2/task/OWNERS [czs007]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.99%. Comparing base (4fdd4d9) to head (8a359f9).
Report is 3 commits behind head on 2.4.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.4   #35963      +/-   ##
==========================================
+ Coverage   81.14%   84.99%   +3.85%     
==========================================
  Files        1057      790     -267     
  Lines      139419   114795   -24624     
==========================================
- Hits       113133    97574   -15559     
+ Misses      21992    12945    -9047     
+ Partials     4294     4276      -18     

Files with missing lines	Coverage Δ
internal/querycoordv2/task/executor.go	80.20% <100.00%> (-1.35%)	⬇️

... and 310 files with indirect coverage changes