fix: APPS-3046 Remove excess content spacing in SlimBlockCTA

[tinuola]

Connected to APPS-3046

Component Updated: BlockCallToAction.vue

Notes:

• Removed excess spacing below SlimCTA text content--coming from RichText component's parsed-content class
• Setting parsed-content's margin-bottom to 0 in the default file does not affect spacing in the default component; text div that is parent to parsed-content already has a margin-bottom value of 32px (which takes precedence over parsed-content's 28px value)

https://deploy-preview-648--ucla-library-storybook.netlify.app/?path=/story/block-call-to-action--ftva-slim-cta-titled

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Checklist:

• [x] I checked that it is working locally in the dev server
• [x] I checked that it is working locally in the storybook
• [x] I checked that it is working locally in the library-website-nuxt dev server
• [x] I added a screenshot of it working
• [ ] UX has reviewed and approved this
• [x] I assigned this PR to someone on the dev team to review
• [x] I used a conventional commit message
• [x] I assigned myself to this PR

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[github-actions[bot]]

🚀 Deployed on https://deploy-preview-648--ucla-library-storybook.netlify.app

[pghorpade]

:tada: This PR is included in version 3.31.6 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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