vttablet debugenv changes

[harshit-gangal]

Description

This PR changes the /debug/env Field names
"PoolSize" -> "ReadPoolSize"
"TxPoolSize" -> "TransactionPoolSize"

It matches the format in which the request is received.
format=json on a POST call to modify the configuration will receive a json response.

Related Issue(s)

Checklist

• 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]

Review Checklist

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 103 lines in your changes missing coverage. Please review.

Project coverage is 67.39%. Comparing base (0726ea6) to head (af23cee).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
go/vt/vttablet/tabletserver/debugenv.go	0.00%	103 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17161      +/-   ##
==========================================
- Coverage   67.40%   67.39%   -0.02%     
==========================================
  Files        1574     1574              
  Lines      253221   253251      +30     
==========================================
- Hits       170690   170679      -11     
- Misses      82531    82572      +41     

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[GuptaManan100]

LGTM