fix: remove forcing RUN_MSSQL_TESTS to be true in tests

[rauno56]

Which problem is this PR solving?

Someone(khm...) has left a typo into the tests forcing MSSQL test always to be run.

[codecov]

Codecov Report

Merging #965 (f17589c) into main (670797a) will decrease coverage by 0.46%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #965      +/-   ##
==========================================
- Coverage   95.91%   95.44%   -0.47%     
==========================================
  Files          13       15       +2     
  Lines         856      966     +110     
  Branches      178      197      +19     
==========================================
+ Hits          821      922     +101     
- Misses         35       44       +9     

Impacted Files	Coverage Δ
plugins/node/instrumentation-tedious/src/utils.ts	88.23% <0.00%> (ø)
...ode/instrumentation-tedious/src/instrumentation.ts	92.47% <0.00%> (ø)