chore: update agentic and classic chat references

Uma Chandran (OOO Aug 28 - Sept 1)requested to merge
uc/update-agentic-classic-duo-language into main

Description

Updates mentions of agentic and classic versions of GitLab Duo Chat in UI copy to align with the latest guidance.

It also fixes a few other terminology mentions to align with the style guide - mainly, to ensure we're saying GitLab before Duo in most places (per legal guidance).

Related language server MR: chore: updates references to agentic and classi... (gitlab-org/editor-extensions/gitlab-lsp!3060 - merged)

Related Issues

Removing Classic from naming (gitlab#592624 - 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
Edited by Uma Chandran (OOO Aug 28 - Sept 1)

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