Fix CI wrt broken coverage upload artifact (#1210)

Apparently the GitHub action https://github.com/actions/upload-artifact
released a breaking change
actions/upload-artifact#602 (not following
semver guidelines) which is affecting our CodeCov job as it's no longer
able to download artifacts that were supposed to be uploaded from our
tests in earlier jobs in the CI.

According to suggestion in
https://github.com/actions/upload-artifact/pull/607/files, set include
include-hidden-files: true, so that our workflow continues to work as it
was before.

.github/workflows/test.yml

@@ -97,6 +97,7 @@ jobs:
         with:
           name: coverage-unit-test-${{ matrix.python-version }}-${{ matrix.airflow-version }}
           path: .coverage
+          include-hidden-files: true
 
   Run-Integration-Tests:
     needs: Authorize
@@ -181,6 +182,7 @@ jobs:
         with:
           name: coverage-integration-test-${{ matrix.python-version }}-${{ matrix.airflow-version }}
           path: .coverage
+          include-hidden-files: true
 
   Run-Integration-Tests-Expensive:
     needs: Authorize
@@ -252,6 +254,7 @@ jobs:
         with:
           name: coverage-integration-expensive-test-${{ matrix.python-version }}-${{ matrix.airflow-version }}
           path: .coverage
+          include-hidden-files: true
 
     env:
       AIRFLOW_HOME: /home/runner/work/astronomer-cosmos/astronomer-cosmos/
@@ -319,6 +322,7 @@ jobs:
         with:
           name: coverage-integration-sqlite-test-${{ matrix.python-version }}-${{ matrix.airflow-version }}
           path: .coverage
+          include-hidden-files: true
 
     env:
       AIRFLOW_HOME: /home/runner/work/astronomer-cosmos/astronomer-cosmos/
@@ -395,6 +399,7 @@ jobs:
         with:
           name: coverage-integration-dbt-1-5-4-test-${{ matrix.python-version }}-${{ matrix.airflow-version }}
           path: .coverage
+          include-hidden-files: true
 
     env:
       AIRFLOW_HOME: /home/runner/work/astronomer-cosmos/astronomer-cosmos/
@@ -538,6 +543,7 @@ jobs:
         with:
           name: coverage-integration-kubernetes-test-${{ matrix.python-version }}-${{ matrix.airflow-version }}
           path: .coverage
+          include-hidden-files: true
 
   Code-Coverage:
     if: github.event.action != 'labeled'