docs(sidepanel, createsidepanel): adds ai label docs

[AlexanderMelox]

Closes #5308 #5307

This PR adds AiLabel docs for SidePanel and CreateSidePanel.

What did you change?

• Removed mdx page
• Added the docs page format
• Added ai label docs and usage

How did you test and verify your work?

Storybook

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 79.65%. Comparing base (48d5c34) to head (9f0547e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #6468 +/- ## ========================================== - Coverage 79.65% 79.65% -0.01% ========================================== Files 394 394 Lines 12871 12871 Branches 4257 4257 ========================================== - Hits 10253 10252 -1 - Misses 2618 2619 +1 ``` | [Components](https://app.codecov.io/gh/carbon-design-system/ibm-products/pull/6468/components?src=pr&el=components&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=carbon-design-system) | Coverage Δ | | |---|---|---| | [ibm-products](https://app.codecov.io/gh/carbon-design-system/ibm-products/pull/6468/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=carbon-design-system) | `∅ <ø> (∅)` | | | [ibm-products-web-components](https://app.codecov.io/gh/carbon-design-system/ibm-products/pull/6468/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=carbon-design-system) | `∅ <ø> (∅)` | |

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[AlexanderMelox]

I've realized that CreateSidePanel still uses the slug prop, have we deprecated the prop?

[elycheea]

I think @devadula-nandan found the same in CreateTearsheet. 🙈