chore(mysql2): remove unused test.js file

[YanivD]

Short description of the changes

• mysql2: Removed test.js unused file

If there is usage for this file, please close this PR without merging.

[codecov]

Codecov Report

Merging #636 (f3f8db4) into main (9197fc3) will increase coverage by 0.43%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #636      +/-   ##
==========================================
+ Coverage   96.68%   97.12%   +0.43%     
==========================================
  Files          13       17       +4     
  Lines         634     1148     +514     
  Branches      124      155      +31     
==========================================
+ Hits          613     1115     +502     
- Misses         21       33      +12     

Impacted Files	Coverage Δ
...pentelemetry-instrumentation-mysql2/src/version.ts	100.00% <0.00%> (ø)
...elemetry-instrumentation-mysql2/test/mysql.test.ts	97.86% <0.00%> (ø)
...etry-instrumentation-mysql2/src/instrumentation.ts	95.00% <0.00%> (ø)
.../opentelemetry-instrumentation-mysql2/src/utils.ts	100.00% <0.00%> (ø)

[dyladan]

I think this file was there as a local test so the instrumentation author could step through an uninstrumented execution with the debugger while developing the instr