sqlparser: Remove unneeded escaping

[dbussink]

It's not necessary to escape a double quote since we quote everything with single quotes. This removes a lot of escaping noise, especially around JSON usage.

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[vitess-bot]

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[GuptaManan100]

Looks good to me in principal, we just need to see if there are any test failures.

[shlomi-noach]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.61%. Comparing base (465ffcf) to head (e73f38f).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16255      +/-   ##
==========================================
+ Coverage   68.58%   68.61%   +0.02%     
==========================================
  Files        1544     1544              
  Lines      197984   197991       +7     
==========================================
+ Hits       135795   135856      +61     
+ Misses      62189    62135      -54     

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