feat: introduced Agentic Duo Chat setting

Denys Mishunovrequested to merge
dmishunov/541924-agentic-chat-setting into main

Description

The MR switches control of the Agentic Chat's availability from the local feature flag to the extension-level setting.

agentic-chat-setting

In addition, to save some time, this MR incorporates a new icon for the GitLab Agentic Duo Chat (thanks, @Sam_Reiss!):

Before After
Screenshot_2025-05-21_at_20.55.55 Screenshot_2025-05-21_at_20.54.28

Related Issues

Resolves https://gitlab.com/gitlab-org/gitlab/-/work_items/541924

How has this been tested?

  • If src/browser or src/common has been modified, please consider interoperability with the Web IDE. See Running the Extension in WebIDE.
  • Consider an end-to-end test for significant new features that aren't covered by integration tests.

Screenshots (if appropriate)

What CHANGELOG entry will this MR create?

  • fix: Bug fix fixes - a user-facing issue in production - included in changelog
  • feature: New feature - a user-facing change which adds functionality - included in changelog
  • BREAKING CHANGE: (fix or feature that would cause existing functionality to change) - should bump major version, mentioned in the changelog
  • None - other non-user-facing changes
Edited by Denys Mishunov

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