feat(nexus): implement config debouncing mechanism

[kptkin]

Fixes

• Fixes WB-NNNNN
• Fixes #NNNN

Description

What does the PR do?

🤖 Generated by Copilot at d8b02e1

This pull request adds config debouncing logic to the nexus sender package, which reduces the server load and improves the performance of the metric feature. It uses a new Debouncer type defined in nexus/internal/debounce/debounce.go and a dependency on the golang.org/x/time package. It also updates some system tests to be compatible with the new logic.

Testing

How was this PR tested?

Checklist

• Include reference to internal ticket "Fixes WB-NNNNN" and/or GitHub issue "Fixes #NNNN" (if applicable)
• Ensure PR title compliance with the conventional commits standards

🤖 Generated by Copilot at d8b02e1

To reduce the config update load
The sender now uses a Debouncer mode
It wraps a rate limiter
And drops the jitter
But ensures the last trigger is showed

[codecov]

Codecov Report

Merging #6331 (d8b02e1) into main (43b2598) will decrease coverage by 0.13%.
The diff coverage is 0.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6331      +/-   ##
==========================================
- Coverage   77.27%   77.15%   -0.13%     
==========================================
  Files         387      387              
  Lines       44462    44470       +8     
==========================================
- Hits        34359    34310      -49     
- Misses      10050    10107      +57     
  Partials       53       53              

Flag	Coverage Δ
unittest	80.94% <ø> (-0.12%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
nexus/pkg/server/sender.go	16.98% <0.00%> (-0.24%)	⬇️

... and 15 files with indirect coverage changes

[dmitryduev]

/fix-title

[dmitryduev]

noice