SAP / ui5-linter / 8388142054

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feat(cli)!: In case of errors, exit with code 1

This change alignes UI5 linter with ESLint (see [1]):
* No errors, maybe warnings: Use exit code 0
* At least one error: Use exit code 1
* Unexpected error (typically caused by an exception): Use exit code 2

BREAKING CHANGE: Depending on how UI5 linter is being used, this change
might change the behavior of that particular scenario. For example a
build script might abort further processing, if any linting errors
are detected.

To ignore exit code 1, for example in a bash script, you may use a
construct like this:
```sh
ui5lint && RC=$? || RC=$?
if [[ "$RC" = 2 ]]; then
    exit 1
fi
```

JIRA: CPOUI5FOUNDATION-823

[1]: https://eslint.org/docs/latest/use/command-line-interface#exit-codes

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