Adjust dimensions for icons in Bulk Edit, Quick Edit, dashboard welcome widget, and admin notifications

[sabernhardt]

• Assigns relative values for line-height, width and height of the icon in buttons that remove, dismiss or close. All three computed values match the font size.
• Reduces top value for dashboard welcome panel dismiss button.

Trac 64685

Use of AI Tools: none

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Props sabernhardt, mukesh27.

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[mukeshpanchal27]

Thanks for the PR!

Why it linked to #64685 as the issue are tend so solve Bulk Edit dropdown height increased compared to previous version