[IMP] test: make test tsconfig work in vscode

The root tsconfig.json file don't include the tests files, to not waste
time compiling the tests when it's not needed.  Another tsconfig file
`tsconfig.test.json` was added in 09863df, to give as argument to jest
to compile the tests.

This file is however not used by VSCode to find errors
in the tests files, and some default ts configuration was used instead.
This led to mismatch between the errors appearing  in the IDE, and errors
when running the tests.

The two most common errors in VSCode were:

- custom jest matcher (eg. `toBeCancelledBecause`) not found
- strict type checking in `test.each` arguments leading to errors

This commit fix the issue by adding a `test/tsconfig.json` file, which
extends the root `tsconfig.json` file, and is used by both jest and
VSCode.

Note that the tests run fine without giving this file to jest, because
the root `tsconfig.json` file is used, and the jest matcher are defined
with `setupFilesAfterEnv` in `package.json`.

Odoo task 3255953

closes #2315

X-original-commit: a4a8230
Signed-off-by: Rémi Rahir (rar) <[email protected]>
Signed-off-by: Minne Adrien (adrm) <[email protected]>

package.json

@@ -125,7 +125,7 @@
     ],
     "globals": {
       "ts-jest": {
-        "tsconfig": "tsconfig.jest.json"
+        "tsconfig": "tests/tsconfig.json"
       }
     }
   },

tests/tsconfig.json

@@ -0,0 +1,7 @@
+{
+  "extends": "../tsconfig.json",
+  "compilerOptions": {
+    "outDir": "../build/js"
+  },
+  "include": ["../src", "."]
+}