Replace `data-confirm` modals with `GlModal` in project branches

Vamsi Vempatirequested to merge
344158-replace-data-confirm-modals-with-glmodal-in-app-views-projects-branches-index-html-haml into master

What does this MR do and why?

Update the confirmation button variant to danger and its label to Delete on delete merged branches confirmation modal.

Screenshots or screen recordings

Without FF With FF (before) With FF (after)
Screen_Shot_2022-02-08_at_12.32.08_PM Screen_Shot_2022-02-08_at_12.24.01_PM Screen_Shot_2022-02-12_at_11.33.17_AM

How to set up and validate locally

  1. Enable the bootstrap_confirmation_modals feature flag: Feature.enable(:bootstrap_confirmation_modals)
  2. Go to a project > Repository > Branches
  3. Click 'Delete merged branches'

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #344158 (closed)

Edited by Vamsi Vempati

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