Enhance Codecov integration (#1136)

* Define sub-projects and set coverage threshold for failure in the `codecov.yml`; make both test execution engines to generate also JUnit reports; upload these JUnit reports to Codecov for analysis

* Fix UI Vite config and add more details to the API is-generated-code script

* Add API JUnit report file to `.gitignore`

* Fix the copy issue by mounting the volume

* put the exact report name to the `docker cp` command

* Added `set -euxo pipeline` to the `test_api_coverage.sh` script; try to fix the missing report issue by setting immutable flag and report directoty

* Revert `chattr` and `set` commands, as they cause errors

* debug

* put the filename of the JUnit report to upload

* `set -euxo pipefail` in `scripts/test_api_coverage.sh`

---------

Co-authored-by: Konstantin Koval

codecov.yml

@@ -1,3 +1,21 @@
 ignore:
   - "api/**/generated.go"
   - "ui/src/**/__generated__"
+coverage:
+  status:
+    project:
+      default:
+        target: auto
+        threshold: 5
+      ui:
+        target: auto
+        threshold: 5
+        flags:
+          - ui
+      api:
+        target: auto
+        threshold: 5
+        flags:
+          - api-sqlite
+          - api-postgres
+          - api-mysql