fix(modal): backdrop click focus to title (backport to 16.x)

[valentin-mladenov]

Backport bb5dafe from #1508.
## PR Checklist

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• If applicable, have a visual design approval

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

• Combobox text line height is relative to parent.

Issue Number: CDE-2232

What is the new behavior?

• Combobox text line height is seto 20px equal to regular body line height.

Does this PR introduce a breaking change?

• Yes
• No

Other information

[github-actions]

👋 @valentin-mladenov,

• 🙏 The Clarity team thanks you for opening a pull request
• 🎉 The build for this PR has succeeded
• 🔍 The PR is now ready for review
• 🍿 In the meantime, view a preview of this PR
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Thank you,

🤖 Clarity Release Bot

[github-actions]

This PR introduces visual changes: dab0ffa
If these changes are intended and correct, please cherry-pick the above commit to this PR.

git checkout combobox-relative-line-height_cde-2232_16.x
git fetch https://github.com/vmware-clarity/ng-clarity.git dab0ffacb181fa469e6dbdff04e4fcd6a818c75b
git cherry-pick dab0ffacb181fa469e6dbdff04e4fcd6a818c75b
git push

[github-actions]

Hi there 👋, this is an automated message. To help Clarity keep track of discussions, we automatically lock closed PRs after 14 days. Please look for another open issue or open a new issue with updated details and reference this one as necessary.