ci: fix visual and a11y test

[juliodialpad]

Description

• Fixed Visual tests
• Fixed a11y tests
• Added the possibility to change dialtone-vue's port by using PORT=XXXX pnpm run storybook so we can run dialtone-vue2 and dialtone-vue3 simultaneously if needed.

Pull Request Checklist

• Ask the contributors if a similar effort is already in process or has been solved.
• Review the contribution guidelines.
• Use staging as your pull request's base branch. (All PRs using production as its base branch will be declined).
• Ensure all gulp scripts successfully compile.
• Update, remove, or extend all affected documentation.
• Ensure no private Dialpad links or info are in the code or pull request description (Dialtone is a public repo!).

Obligatory GIF (super important!)

[github-actions]

✔️ Dialtone Deploy Preview ready!
😎 Browse the preview: https://dialtone.dialpad.com/deploy-previews/pr-45/

[github-actions]

✔️ Dialtone-vue 2 Deploy Preview ready!
😎 Browse the preview: https://dialtone.dialpad.com/vue/deploy-previews/pr-45/

[github-actions]

✔️ Dialtone Deploy Preview ready!
😎 Browse the preview: https://dialtone.dialpad.com/deploy-previews/pr-45/

[github-actions]

✔️ Dialtone-vue 2 Deploy Preview ready!
😎 Browse the preview: https://dialtone.dialpad.com/vue/deploy-previews/pr-45/

[github-actions]

✔️ Dialtone-vue 3 Deploy Preview ready!
😎 Browse the preview: https://dialtone.dialpad.com/vue3/deploy-previews/pr-45/

[juliodialpad]

Tests seem to be running correctly now, but we're missing the percy integration permissions on GitHub, once we have that integration setup, we'll have the workflow prompt again.