ENG: Replace all instances of all-caps with title-case

## Goal
Our `all-caps` type is off brand and we should replace it with `title-case`. Instances using the `SlpTypography` `all-caps` variant have been identified, but we should do further research as part of this issue as to where `text-transform: uppercase` might be being used as an alternative and change those if applicable.

Related: https://gitlab.com/gitlab-com/marketing/digital-experience/buyer-experience/-/issues/1554

Additional context: https://gitlab.com/gitlab-com/marketing/digital-experience/slippers-ui/-/issues/236#note_1156356616


**What is the ultimate end goal vision vs the MVC1 iteration?**
 - The end goal for this iteration is that there are no instance of `all-caps` or similar `uppercase` style type across Buyer Experience - they should be replaced with a different type style.


## File(s)
The following files have instances of `all-caps` but this does NOT include instances of `text-transform: uppercase`.

<details><summary>Click to expand</summary>

1. `/common/blog-cards.vue`
1. `/common/event-card.vue`
1. `/common/side-navigation.vue`
1. `/customers/blog-card.vue`
1. `/customers/casestudy-card.vue`
1. `/events/event-card.vue`
1. `/events/carousel/carousel-card.vue`
1. `/features/feature-get-started.vue`
1. `/features/features-filter.vue`
1. `/features/features-product-category-cards.vue`
1. `/home/resource-cards.vue`
1. `/partners/technology-partners/platform-section.vue`
1. `/pricing/plans/feature-item-card.vue`
1. `/solutions/carousel-video-card.vue`
1. `/solutions/resource-cards-video-card.vue`
1. `/solutions/resource-cards.vue`
1. `/solutions/solutions-cards.vue`
1. `/solutions/video-card.vue`
1. `/solutions/by-solution/by-solution-value-prop.vue`
1. `/ten/event-card.vue`
1. `/topics/header.vue` (2x)
1. `/why/case-studies.vue`
1. `/platform.vue` (page)
1. `/install.vue` (page)
1. `/learn.vue` (page)
1. `/pricing.vue` (page)
1. `support/_support.vue` (page template)
1. `/support` (page)
</details>

## Updates

<details><summary>Click to expand</summary>

| Update | Visual |
| ------ | ------ |
| [Cards](https://www.figma.com/file/nWIOpmuMp7RZXmfTj6ujAF/Slippers_foundations?node-id=5581%3A12428): replace all-caps with `Body/Regular/2 (sm)`       |    ![image](/uploads/4e0079f87be42882f1fdc1874dfddf3f/image.png)    |
| [Side Navigation - Variant 2](https://www.figma.com/file/nWIOpmuMp7RZXmfTj6ujAF/Slippers_foundations?node-id=12089%3A13788): replace all-caps with `Body/Bold/3 (xs-bold)`       |    ![image](/uploads/5a8e330ec961b240f80dfc1e73e7a28a/image.png)    |
| [Side Navigation](https://www.figma.com/file/nWIOpmuMp7RZXmfTj6ujAF/Slippers_foundations?node-id=9248%3A17115): replace all-caps with `Body/Bold/3 (xs-bold)` | ![image](/uploads/9f5d6e1dc3c12be643eaaa5dd8fbea12/image.png) |

</details>

## DCI
[DRI, Consulted, Informed](https://about.gitlab.com/handbook/people-group/directly-responsible-individuals/#dri-consulted-informed-dci)

- [ ] DRI: @Tinaliseng 
- [ ] Consulted: @meganfilo 
- [ ] Informed: `Everyone`


## Requirements
What are the requirements for this request? Checklist below is an example of common requirements, please check all that apply and adjust as necessary:

- [ ] Copy writing
- [ ] Illustration
- [ ] Custom Graphics
- [ ] Research
- [ ] Data / Analytics
- [ ] UX Design
- [x] Engineering

Story points: 3.0