fix: fix sha256_password to work correctly over a TLS connection

[viladimiru]

After reading the MySQL documentation, I understood that the sha256_password plugin works partially correctly, but it did not account for the fact that manual encryption is not required when connecting via TLS.

documentation

Follow up for #2888

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.80%. Comparing base (ef47e49) to head (93ebb2c).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/auth_plugins/sha256_password.js	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3809      +/-   ##
==========================================
- Coverage   89.83%   89.80%   -0.04%     
==========================================
  Files          86       86              
  Lines       13596    13601       +5     
  Branches     1606     1606              
==========================================
  Hits        12214    12214              
- Misses       1382     1387       +5     

Flag	Coverage Δ
compression-0	88.91% <0.00%> (-0.04%)	⬇️
compression-1	89.78% <0.00%> (-0.04%)	⬇️
static-parser-0	87.37% <0.00%> (-0.04%)	⬇️
static-parser-1	88.14% <0.00%> (-0.04%)	⬇️
tls-0	89.22% <0.00%> (-0.04%)	⬇️
tls-1	89.57% <0.00%> (-0.04%)	⬇️

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