Code Quality: Remove deprecated __nextHasNoMarginBottom prop

[yogeshbhutkar]

What, Why, and How?

Removes the usage of the deprecated __nextHasNoMarginBottom prop as it's the default behavior since WordPress 7.0. The soft deprecation was introduced in WP 6.7 and scheduled to be removed in WP 7.0.

Related:
WordPress/gutenberg#73848
WordPress/gutenberg#75139

Use of AI Tools

None

Testing Instructions

1. Tests should pass
2. No visual diff

Changelog Entry

Removed - deprecated __nextHasNoMarginBottom prop

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.18%. Comparing base (3624c91) to head (acb212d).

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #609   +/-   ##
==========================================
  Coverage      73.18%   73.18%           
  Complexity      1731     1731           
==========================================
  Files             85       85           
  Lines           7473     7473           
==========================================
  Hits            5469     5469           
  Misses          2004     2004           

Flag	Coverage Δ
unit	73.18% <ø> (ø)

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[github-actions]

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Co-authored-by: yogeshbhutkar <yogeshbhutkar@git.wordpress.org>

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