feat(lightbox): add divider over footer

[saiponnada]

Fixes #2408

• This PR contains CSS changes
• This PR does not contain CSS changes

Description

• Added border top to show the divider over the lightbox footer.

Notes

• Not sure why padding-top was set to 0 in dialog-footer-content-large mixin. Removed assuming legacy code.

Screenshots

Checklist

• I verify the build is in a non-broken state
• I verify all changes are within scope of the linked issue

• I regenerated all CSS files under dist folder
• I tested the UI in all supported browsers
• I did a visual regression check of the components impacted by doing a Percy build and approved the build
• I tested the UI in dark mode and RTL mode
• I added/updated/removed Storybook coverage as appropriate

[changeset-bot]

🦋 Changeset detected

Latest commit: 45505f8

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@ebay/skin	Minor

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