Fix silently broken test_version.sh tests (#1716)

Fixes silently broken tests depending on `test_version/test_reporter`
and adds an assertion to avoid future silent breakages. Part of #1482
and #1652.

- Moves `test_version/version_specific_tests_dir/scala_repositories.bzl`
  to `test_version`.

- Updates `test_version.sh` to copy this file into test repos generated
  from both `version_specific_tests_dir` and `test_reporter`.

- Updates `compilation_should_fail` to break if the `bazel build` output
  doesn't contain the expected `ErrorFile.scala` error.

The affected test cases expect their underlying builds to fail because
of errors in `test_version/test_reporter/ErrorFile.scala`. Failing Scala
2.x build output should contain:

```txt
ErrorFile.scala:6: ')' expected but '}' found
```

Failing Scala 3.x build output should contain:

```txt
-- [E040] Syntax Error: ErrorFile.scala:6:2 ------------------------------------
6 |  }
  |  ^
  |  ')' expected, but '}' found
```

Using `RULES_SCALA_TEST_ONLY` to select an affected test case revealed
that the underlying build actually failed because Bazel couldn't find
`//:scrooge_repositories.bzl`:

```txt
$ RULES_SCALA_TEST_ONLY="test_reporter 2.12.20 //:diagnostics_reporter_toolchain" \
  ./test_version.sh

running test test_reporter 2.12.20 //:diagnostics_reporter_toolchain
Starting local Bazel server and connecting to it...
Computing main repo mapping:
ERROR: Error computing the main repository mapping:
  cannot load '//:scrooge_repositories.bzl': no such file

$ echo $?

0
```

Author: mbland

test_version.sh

@@ -16,11 +16,26 @@ compilation_should_fail() {
   # runs the tests locally
   set +e
   TEST_ARG=$@
-  DUMMY=$(bazel $TEST_ARG)
+  OUTPUT="$(bazel $TEST_ARG 2>&1)"
   RESPONSE_CODE=$?
+  set -e
+
   if [ $RESPONSE_CODE -eq 0 ]; then
     echo -e "${RED} \"bazel $TEST_ARG\" should have failed but passed. $NC"
+    echo "$OUTPUT"
     return -1
+  fi
+
+  local expected_error_pattern=(
+    "ErrorFile\.scala:6:[[:print:][:space:]]*'[)]' expected,? but '[}]' found"
+  )
+
+  if [[ ! "$OUTPUT" =~ $expected_error_pattern ]]; then
+    echo -e "${RED}  \"bazel $*\" failure should have matched:"
+    echo -e "    ${expected_error_pattern}"
+    echo -e "  got:${NC}"
+    echo "$OUTPUT"
+    return 1
   else
     return 0
   fi
@@ -45,12 +60,12 @@ run_in_test_repo() {
 
   if [[ -n "$TWITTER_SCROOGE_VERSION" ]]; then
     local version_param="version = \"$TWITTER_SCROOGE_VERSION\""
-    scrooge_ws="$version_param"
+    scrooge_ws="$version_param\\n"
   fi
 
-  sed -e "s%\${twitter_scrooge_repositories}%${scrooge_ws}\n%" \
+  sed -e "s%\${twitter_scrooge_repositories}%${scrooge_ws}%" \
       WORKSPACE.template >> $NEW_TEST_DIR/WORKSPACE
-  cp ../.bazel{rc,version} $NEW_TEST_DIR/
+  cp ../.bazel{rc,version} scrooge_repositories.bzl $NEW_TEST_DIR/
 
   cd $NEW_TEST_DIR