fix: removing the namespace removeKeyPrefix with v6

[jaredwray]

Please check if the PR fulfills these requirements

• Followed the Contributing and Code of Conduct guidelines.
• Tests for the changes have been added (for bug fixes/features) with 100% code coverage.

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
fix: removing the namespace removeKeyPrefix with v6

[gemini-code-assist]

Code Review

This pull request removes the removeKeyPrefix method and its usages across various database operations (get, set, delete, has, etc.) in the MySQL storage adapter, ensuring that keys matching or starting with the namespace prefix are not incorrectly stripped. Additionally, new tests are introduced to verify namespace preservation. The review feedback suggests a performance improvement for the delete method by executing the DELETE query directly and checking affectedRows instead of performing an unnecessary preliminary SELECT query.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (86b61c8) to head (b8dfeac).

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #2013   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           55        55           
  Lines         4896      4878   -18     
  Branches       784       776    -8     
=========================================
- Hits          4896      4878   -18     

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