AI Chat: Integrate search events from the Conversation API

[petemill]

The Conversation API is now returning events related to Brave Search. We can implement the designed statuses:

• Search in progress

• Search queries used to generate a response

[MadhaviSeelam]

Verification PASSED` using

Brave | 1.67.92 Chromium: 125.0.6422.76 (Official Build) beta (64-bit)
-- | --
Revision | d751d2edf40b466560aaeecc4c4919041f41c20d
OS | Windows 11 Version 23H2 (Build 22631.3593)

1. Installed 1.67.92
2. launched Brave with --enable-logging=stderr --v=2 --enable-features=AIChat:conversation_api/true --env-leo=staging --env-ai-chat.bsg-dev --env-ai-chat-premium.bsg.dev--env-leo=staging --env-ai-chat.bsg=dev --env-ai-chat-premium.bsg=dev
3. logged in with or without Leo premium user
4. opened brave://settings/leo-assistant in a new tab and selected models as below
5. verified with all four models with a prompt What are some of the top tourist attractions in Ireland?

Mixtral - PASSED

• Verified with Premium & Free subscriptions as well.
• Confirmed Search in progress status returned with Improving answer with Brave Search... text shown briefly before search results returned
• Confirmed Search queries used to generate a response status returned with `Improved answer searching for "top tourist attractions in Ireland", "most popular tourist destinations in Ireland". are shown

example	example

Claude Instant - PASSED

• Confirmed Search in progress status returned with Improving answer with Brave Search... text shown briefly before search results returned
• Confirmed Search queries used to generate a response status returned with `Improved answer searching for "top tourist attractions in Ireland". are shown

example	example	example

Claude 3 Haiku - PASSED

• Confirmed Search in progress status returned with Improving answer with Brave Search... text shown briefly before search results returned
• Confirmed Search queries used to generate a response status returned with `Improved answer searching for "top tourist attractions in Ireland". are shown

example	example	example	example

Claude 3 Sonnet - PASSED

• Logged in as Premium user
• Confirmed Search in progress status returned with Improving answer with Brave Search... text shown briefly before search results returned
• Confirmed Search queries used to generate a response status returned with `Improved answer searching for "top tourist attractions in Ireland". are shown

example	example	example	example

[Uni-verse]

Verified on Samsung Galaxy S21 using version:

Brave	1.67.113 Chromium: 126.0.6478.56 (Official Build) (64-bit) 
Revision	2c6c9c73e7382e94dd9f7327dff55cb1fe56ff59
OS	Android 13; Build/TP1A.220624.014; 33; REL

• Ensured improved answer with Brave Search loader is shown for queries.
• Ensured search integration is working with all models for free and premium users.
• Ensured chat responses are labelled using Improved answer searching....

Mixtral	Haiku	Sonnet	Llama