Exit script with error even if token is provided

[weynsee]

Description

When bundlesize fails a check, exit with status code of 1.

Motivation and Context

In certain CIs, the exit status is used to indicate whether the build succeeded or failed. Currently, if a CI token is provided, the build exits with 0 status code always (even if the check failed) hence some CIs will always mark bundlesize builds as successful.

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
  Previously passing builds in CIs will now fail if bundlesize check fails.

Checklist:

• My code follows the code style of this project. ✅
• If my change requires a change to the documentation I have updated the documentation accordingly. ✅
• I have read the CONTRIBUTING document. ✅
• I created an issue for the Pull Request ✅

[oliverviljamaa]

@siddharthkp Have you considered this PR?

[kefranabg]

Some news on this PR ? bundlesize cannot be used on CI process without this feature 😕