feat: [2.5]add str update ts in describecollection

[JsDove]

issue:#39093
pr:#39096

[mergify]

@JsDove go-sdk check failed, comment rerun go-sdk can trigger the job again.

[mergify]

@JsDove E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.73%. Comparing base (c40e8cf) to head (4c2c74c).
Report is 3 commits behind head on 2.5.

Additional details and impacted files

@@             Coverage Diff             @@
##              2.5   #41600       +/-   ##
===========================================
+ Coverage   70.68%   80.73%   +10.05%     
===========================================
  Files         306     1423     +1117     
  Lines       29786   204257   +174471     
===========================================
+ Hits        21053   164901   +143848     
- Misses       8733    33565    +24832     
- Partials        0     5791     +5791     

Components	Coverage Δ
Client	79.65% <ø> (∅)
Core	70.68% <ø> (ø)
Go	82.71% <100.00%> (∅)

Files with missing lines	Coverage Δ
internal/proxy/task.go	84.58% <100.00%> (ø)
internal/rootcoord/root_coord.go	90.13% <100.00%> (ø)

... and 1115 files with indirect coverage changes

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[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[czs007]

/lgtm