VStreamer: add throttled logs when row/result/vstreamers get throttled.

[rohit-nayak-ps]

Description

Currently we don't log when a rowstreamer, resultstreamer or vstreamer gets throttled. There are times when, due to configuration issues or a replication lag, these can get throttled permanently or for long. We do log this in the target's vreplication row and in debug/vars, but there are times when we only have access to the past logs.

The throttler checks every 250ms, which is obviously too often to log. This PR uses the ThrottledLogger to log every five minutes to improve visibility.

Related Issue(s)

Checklist

• [ ] "Backport to:" labels have been added if this change should be back-ported to release branches
• [ ] If this change is to be back-ported to previous releases, a justification is included in the PR description
• [ ] Tests were added or are not required
• [ ] Did the new or modified tests pass consistently locally and on CI?
• [ ] Documentation was added or is not required

Deployment Notes

[vitess-bot[bot]]

Review Checklist

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 66.66667% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 38.90%. Comparing base (961a978) to head (a5ca0a5). Report is 256 commits behind head on main.

Files	Patch %	Lines
.../vttablet/tabletserver/vstreamer/resultstreamer.go	66.66%	1 Missing :warning:
.../vt/vttablet/tabletserver/vstreamer/rowstreamer.go	50.00%	1 Missing :warning:
go/vt/vttablet/tabletserver/vstreamer/vstreamer.go	50.00%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##             main   #14936       +/-   ##
===========================================
- Coverage   47.28%   38.90%    -8.38%     
===========================================
  Files        1136     1643      +507     
  Lines      238587   384592   +146005     
===========================================
+ Hits       112823   149638    +36815     
- Misses     117147   219105   +101958     
- Partials     8617    15849     +7232     

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