fix(side panel): slideIn not working as expected in Storybook

[sangeethababu9223]

Closes #6480

The SlideIn option is not working as expected. Its behavior is currently identical to that of the SlideOver option, which should not be the case.

What did you change?

The issue was with storybook styling. I referred web components package to update the style and HTML in SlideIn Template in SidePanel.stories.jsx

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 79.84%. Comparing base (1d049e0) to head (0ce441f). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #6501 +/- ## ======================================= Coverage 79.83% 79.84% ======================================= Files 394 394 Lines 12872 12872 Branches 4257 4257 ======================================= + Hits 10277 10278 +1 + Misses 2595 2594 -1 ``` | [Components](https://app.codecov.io/gh/carbon-design-system/ibm-products/pull/6501/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/6501/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/6501/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=carbon-design-system) | `∅ <ø> (∅)` | |