chore: clean up UseDuoChatUiForFlow feature flag

Andrew Fontainerequested to merge
afontaine/clean-up-chat-flow-flag into main

Description

It has been rolled out now, so we no longer need the flag.

Matching LSP MR in gitlab-org/editor-extensions/gitlab-lsp!2741 (merged)

Related Issues

gitlab-org/editor-extensions/gitlab-lsp#1624 (closed)

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

Merge request reports