Fix: Dashboard welcome panel and widgets misalignment

[hbhalodia]

Trac ticket: https://core.trac.wordpress.org/ticket/64739

• Revert the logic for cards on dashboard to previous to make it align.
• Can have other logic as well, if we specifically needs padding on the card, as padding counts inbound, so it will definately shrink in size.
• Use of negative margin and add same margin for spacings.

Use of AI Tools

• None

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[github-actions]

A commit was made that fixes the Trac ticket referenced in the description of this pull request.

SVN changeset: 61759
GitHub commit: 68194d5

This PR will be closed, but please confirm the accuracy of this and reopen if there is more work to be done.