vtorc: use REPLACE INTO in node_health table update

[timvaillancourt]

Description

This PR updates the code that updates the node_health sqlite3 table in VTOrc to use a single REPLACE INTO vs a DELETE FROM + INSERT INTO

I believe in the end both approaches achieve a 1-row table, but the REPLACE INTO approach is more efficient

Related Issue(s)

#17330

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[vitess-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.44%. Comparing base (413b953) to head (5cf33b4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #17847   +/-   ##
=======================================
  Coverage   67.44%   67.44%           
=======================================
  Files        1592     1592           
  Lines      258205   258200    -5     
=======================================
+ Hits       174151   174155    +4     
+ Misses      84054    84045    -9     

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[timvaillancourt]

Nevermind, there is no primary key so this creates a new row every call