Update cppcheck (#5108)

Re-enable cppcheck CI job

Update cppcheck suppression list:
    The new version of cppcheck raises warnings for many potential
    issues that are guarded against, so those warnings have been
    supressed.

Handle realloc failures:
    - jerry-ext/util/sources.c
    - jerry-port/common/jerry-port-io.c

Refactor test-snapshot: move each test to separate functions like some
others already were.

Rename `handler` variables inside `main` of `test-api.c` as they
shadowed the `handler` function in the same file.

JerryScript-DCO-1.0-Signed-off-by: Máté Tokodi mate.tokodi@szteszoftver.hu

.github/workflows/gh-actions.yml

@@ -17,8 +17,8 @@ jobs:
           python-version: '3.10'
       - run: sudo apt update
 # TODO: update checkers to current versions available in ubuntu 22.04
-#      - run: sudo apt install clang-format-10 cppcheck python-serial
-      - run: sudo apt install pylint doxygen
+#      - run: sudo apt install clang-format-10 python-serial
+      - run: sudo apt install pylint doxygen cppcheck
       - run: $RUNNER --check-signed-off=gh-actions
         if: ${{ always() }}
       - run: $RUNNER --check-doxygen
@@ -31,8 +31,8 @@ jobs:
 #        if: ${{ always() }}
       - run: $RUNNER --check-pylint
         if: ${{ always() }}
-#      - run: $RUNNER --check-cppcheck
-#        if: ${{ always() }}
+      - run: $RUNNER --check-cppcheck
+        if: ${{ always() }}
 
   Linux_x86-64_Build_Correctness_Debugger_Tests:
     runs-on: ubuntu-latest