exit 1 does now show failure on Windows

Summary

Steps to reproduce

.gitlab-ci.yml

```yaml
stages:
  - build
  - deploy
variables:
  FF_ENABLE_BASH_EXIT_CODE_CHECK: 'true'
  
build-service:
  stage: build
  tags: 
    - vs2019
  script:
    - cd buildscripts
    # build and run tests
    #- .\build.ps1
    #- echo "Build completed" + $Env:LASTEXITCODE
    - exit 1

</details>

## Actual behavior

<!--
job shows succeeded
-->

## Expected behavior

<!--
Job should show failure
-->

## Relevant logs and/or screenshots

<!--
Paste the job logs inside of the code blocks (```) below so it would be
easier to read.
-->

<details>
<summary> job log </summary>

```sh
Loading history...
5:50
Running with gitlab-runner 14.1.0 (8925d9a0)
  on NWKBuild3 xUWEXRen
  feature flags: FF_ENABLE_BASH_EXIT_CODE_CHECK:true
Preparing the "shell" executor
00:00
Using Shell executor...
Preparing environment
00:02
Running on NWKBUILD3...
Getting source from Git repository
Fetching changes...
Reinitialized existing Git repository in C:/Gitlab-Runner/builds/xUWEXRen/0/mis/rmaswap-microservice-azurefunctions/.git/
Checking out 1760040c as 92-add-tests-for-json-files...
git-lfs/2.13.3 (GitHub; windows amd64; go 1.16.2; git a5e65851)
Skipping Git submodules setup
Executing "step_script" stage of the job script
00:01
$ cd buildscripts
$ exit 1
Cleaning up file based variables
00:02
Job succeeded

Environment description

config.toml contents

concurrent = 1
check_interval = 0

[session_server]
  session_timeout = 1800

[[runners]]
  name = "NWKBuild3"
  url = "https://git.socketmobile.com/"
  token = "xUWEXRen5ykyPKsnRb8J"
  executor = "shell"
  shell = "powershell"
  [runners.custom_build_dir]
  [runners.cache]
    [runners.cache.s3]
    [runners.cache.gcs]
    [runners.cache.azure]

Used GitLab Runner version

Possible fixes