AI Chat - remove basic model concept

[petemill]

All models should now behave the same for non-premium users (same rate limiting), so we should not point to a basic model when rate-limited on a "freemium" model.

Test plan

When rate limited for non-premium users there should no longer be a "switch to basic model" button. This variant should be deleted. (note: this is available in storybook since it's difficult to actually trigger)

[Gitchick57]

Funny, as I am trying to figure out how completely disable it on my Brave browser.  I can't stop it from providing answers to my searches when I have disabled it in settings.

May 29, 2024, 1:19 PM by @.***:

All models should now behave the same for non-premium users (same rate limiting), so we should not point to a basic model when rate-limited on a "freemium" model.

We should also instead promote the 7-day free trial of premium.

Fulfills client-side for > #37961 https://github.com/brave/brave-browser/issues/37961

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[kjozwiak]

The above requires 1.67.109 or higher for 1.67.x verification 👍

[stephendonner]

Verified PASSED using

Brave | 1.67.109 Chromium: 126.0.6478.40 (Official Build) (x86_64)
-- | --
Revision | 98d88735f6123b755c0614e42e7868f70c35ec33
OS | macOS Version 11.7.10 (Build 20G1427)

Steps:

1. installed 1.67.109
2. launched Brave (no commandline args this time)
3. opted-in to Leo
4. clicked on Summarize this page for a few sites using Mixtral, Claude 3 Haiku, and Llama 3 8b, within an hour time-frame
5. confirmed I hit the rate-limit dialog
6. clicked on No thanks
7. confirmed dialog was dismissed
8. clicked on the Settings-gear icon in the Leo pane
9. clicked on Claude 3 Sonnet labelled as [PREMIUM]
10. confirmed Premium-upsell dialog
11. clicked on Switch to the free model
12. waited a bit (to clear rate limiting)

Confirmed

• no lock 🔒 icon in the menus - either in brave://settings/leo-assistant or the flyout menu
• no [UNLIMITED]/[LIMITED] badging/labelling
• only badging/labelling is for and on Claude 3 Sonnet as [PREMIUM]

Free models

### Confirmed regular `LLama 3 8b` and other-model usage `brave://settings` | `Mixtral` | `Claude 3 Haiku` | `Claude 3 Sonnet [PREMIUM]` | ` Llama 3 8b` ----------|----------|-----------|----------|---------------- | | | (skipped, see below) |

Premium model, Claude 3 Sonnet

example | `upsell dialog` | example | example | example | example ----------|----------|-----------|----------|-------------|---------- | | | | |

[GeetaSarvadnya]

Verification PASSED on Vivo X70 Pro version 12 running Bravemonoarm64.apk_1.67.112

Clean profile

Premium user_PASSED

- Clean profile 1.67.x - Opt-in Leo as a Premium user via 3 dot menu - Click on Gear icon ## Confirmed * *no* `lock` 🔒 icon in the menus - either in Leo app menu settings or the flyout menu * no `[UNLIMITED]`/`[LIMITED]` badging/labelling Example | Example -----------|---------  | 

non-premium user_PASSED

- Clean profile 1.67.x - Opt-in Leo as a Free user via 3 dot menu - Click on Gear icon ## Confirmed * *no* `lock` 🔒 icon in the menus - either in Leo app menu settings or the flyout menu * no `[UNLIMITED]`/`[LIMITED]` badging/labelling * only badging/labelling is for and on `Claude 3 Sonnet` as `[PREMIUM]` Example | Example -----------|---------  | 

Upgrade profile

Premium user_PASSED

- Clean profile 1.66.x - Opt-in Leo as a Premium user via 3 dot menu - Click on Gear icon via Leo app settings menu 1.66.x | 1.66.x -------|-------  |  - Upgrade the profile 1.67.x - Click on Gear icon via Leo app settings menu 1.67.x | 1.67.x -------|-------  |  ## Confirmed * *no* `lock` 🔒 icon in the menus - either in Leo app menu settings or the flyout menu * no `[UNLIMITED]`/`[LIMITED]` badging/labelling

non-premium user_PASSED

- Clean profile 1.66.x - Opt-in Leo as a Free user via 3 dot menu - Click on Gear icon via Leo app settings menu 1.66.x | 1.66.x | 1.66.x -------|-------|--------  |  |  - Upgrade the profile to 1.67.x - Click on Gear icon via Leo app settings menu 1.67.x | 1.67.x | 1.67.x -------|-------|---------  |  |  ## Confirmed * *no* `lock` 🔒 icon in the menus - either in Leo app menu settings or the flyout menu * no `[UNLIMITED]`/`[LIMITED]` badging/labelling * only badging/labelling is for and on `Claude 3 Sonnet` as `[PREMIUM]`