Fix tests for ci/runner/components/runner_form_fields.vue in Vue 3

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Description

One file in the runner unit test suite is failing when using Vue 3 in compatibility mode.

$ VUE_VERSION=3 yarn jest spec/frontend/ci/runner/components/runner_form_fields_spec.js

Possible fixes

2 tests fail in this suite due to incompatibilities in the gitlab-ui form components due to changes in the v-model API.

We should address this issue in the form components to reach a root cause.

Edited by 🤖 GitLab Bot 🤖