Use yaml file instead of deprecated .docstr_coverage file (pyccel#1816)

According to the docstring of `docstr-coverage`, the flag
`--docstr-ignore-file` is deprecated. A json config file should be used
instead. This PR updates our methodology to use that flag

Author: EmilyBourne

.docstr.yaml

@@ -0,0 +1,10 @@
+skip_magic: True
+skip_init: True
+fail_under: 0
+ignore_patterns:
+  "syntactic":
+    - "_visit_.*"
+  "semantic":
+    - "_visit_.*"
+  ".*code":
+    - "_print_.*"

.docstr_coverage

@@ -74,9 +74,8 @@ jobs:
       - name: Check doc coverage
         id: doc_coverage
         run: |
-          echo "${{ github.event.pull_request.base.sha }}"
-          docstr-coverage --skip-magic --skip-init --fail-under=0 --docstr-ignore-file=base/.docstr_coverage base/pyccel base/ci_tools 2>&1 | tee base_cov
-          docstr-coverage --skip-magic --skip-init --fail-under=0 --docstr-ignore-file=compare/.docstr_coverage compare/pyccel compare/ci_tools 2>&1 | tee compare_cov
+          docstr-coverage --config=base/.docstr.yaml base/pyccel base/ci_tools 2>&1 | tee base_cov
+          docstr-coverage --config=compare/.docstr.yaml compare/pyccel compare/ci_tools 2>&1 | tee compare_cov
           export PYTHONPATH=compare
           python compare/ci_tools/summarise_doccoverage.py compare_cov base_cov $GITHUB_STEP_SUMMARY
         shell: bash