Use regex for tests

[blegat]

Fixes a warning that is currently displayed

┌ Warning: The exclude string "test_linear_integration" is ambiguous because it exactly matches a test, but it also partially matches another. Use `r"^test_linear_integration$"` to exclude the exactly matching test, or `r"test_linear_integration.*"` to exclude all partially matching tests.
└ @ MathOptInterface.Test ~/.julia/packages/MathOptInterface/yI6C0/src/Test/Test.jl:237

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.70%. Comparing base (852579a) to head (df805a1).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #151   +/-   ##
=======================================
  Coverage   78.70%   78.70%           
=======================================
  Files           3        3           
  Lines         263      263           
=======================================
  Hits          207      207           
  Misses         56       56           

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