fix(ci): remove duplicated commands (#818)

Author: jorgepiloto

.github/workflows/ci_cd_release.yml

@@ -292,7 +292,6 @@ jobs:
           docker exec \
             --workdir ${{ env.PYSTK_DIR }} \
             "${STK_CONTAINER}" /bin/bash -c \
-            "export COVERAGE_FILE=.cov/extensions && tox -e tests-extensions-cov"
             "export COVERAGE_FILE=.cov/migration && tox -e tests-core-migration-cov"
 
       - name: "Run the aviator tests"
@@ -311,7 +310,6 @@ jobs:
           docker exec \
             --workdir ${{ env.PYSTK_DIR }} \
             "${STK_CONTAINER}" /bin/bash -c \
-            "export COVERAGE_FILE=.cov/aviator && tox -e tests-core-aviator-graphics-cov-linux"
             "export COVERAGE_FILE=.cov/stknogfx && tox -e tests-core-stk-nographics-cov-linux"
 
       - name: "Run the graphics only stk tests"