app/vmagent: Add remoteWrite.retryMinInterval and remoteWrite.retryMaxTime flags

[yorik]

Describe Your Changes

Add RemoteWrite Retry Controls

This PR introduces two new flags to the remote write functionality:

• remoteWrite.retryMinInterval
• remoteWrite.retryMaxTime

These flags provide finer control over the retry behavior for remoteWrite operations, allowing users to customize the minimum interval between retries and the maximum duration for retry attempts.

Fixes #5486.

Checklist

• The following checks are mandatory:

My change adheres VictoriaMetrics contributing guidelines.

[zekker6]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 58.29%. Comparing base (8aaa828) to head (9bcb9cb).
Report is 759 commits behind head on master.

❗ Current head 9bcb9cb differs from pull request most recent head 4f51846

Please upload reports for the commit 4f51846 to get more accurate results.

Files	Patch %	Lines
app/vmagent/remotewrite/client.go	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6289      +/-   ##
==========================================
- Coverage   60.37%   58.29%   -2.09%     
==========================================
  Files         411      609     +198     
  Lines       76609    82840    +6231     
==========================================
+ Hits        46253    48291    +2038     
- Misses      27794    31324    +3530     
- Partials     2562     3225     +663     

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