MWPW-147173 - Add gap below Aside notification headings

[elan-tbx]

• This fix is specific to Asides with the notification variant that do NOT have body copy. Without body copy, the heading butts up right against the CTAs. This PR fixes that.

Resolves: MWPW-147173

Test URLs:
Milo:

• Before: https://main--milo--adobecom.hlx.page/drafts/ebartholomew/aside-lg-test?martech=off
• After: https://ebartholomew-mwpw-147173-aside-heading-space--milo--adobecom.hlx.page/drafts/ebartholomew/aside-lg-test?martech=off

Bacom:

• Before: https://main--bacom--adobecom.hlx.page/drafts/aortolani/aside-lg-test?martech=off
• After: https://main--bacom--adobecom.hlx.page/drafts/aortolani/aside-lg-test?milolibs=ebartholomew-MWPW-147173-aside-heading-space&martech=off

[aem-code-sync]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch and validate page speed.
In case there are problems, just click a checkbox below to rerun the respective action.

• Re-run PSI checks
• Re-sync branch

Commits

• 72c7909 ✅ (latest)
• e344ded ✅
• 38a79ae ✅
• 80d6eda ✅
• 8488ce9 ✅

[aem-code-sync]

Page	Scores	Audits	Google
/drafts/ebartholomew/aside-lg-test?martech=off

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.70%. Comparing base (73af8b8) to head (72c7909).

Additional details and impacted files

@@            Coverage Diff             @@
##            stage    #2255      +/-   ##
==========================================
- Coverage   95.71%   95.70%   -0.01%     
==========================================
  Files         166      166              
  Lines       44009    44009              
==========================================
- Hits        42124    42120       -4     
- Misses       1885     1889       +4     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[github-actions]

This pull request is not passing all required checks. Please see this discussion for information on how to get all checks passing. Inconsistent checks can be manually retried. If a test absolutely can not pass for a good reason, please add a comment with an explanation to the PR.

[SilviuLCF]

Verified, testing details: MWPW-147173