Fix #11074: Can't change sphinxnote to use sphinxheavybox

[jfbu]

I have made an entry in Bugfixes, but as I commened in #11074 I did not consider the changed behavior at 5.1.0 as a bug (it would have been a regression), as it was never said explicitly one could use sphinxheavybox without precautions directly.

Memo: this allows to let sphinxnote etc... use sphinxheavybox but do not deduce one can wrap arbitrarily this way for a new environment unrelated to admonitions: under the hood there is sphinxadmonition dispatch which does some preparatory steps before the sphinxnote etc... are actually executed.

Fixes #11074

[jfbu]

I will merge this after testing completes as the ruff linting failure is unrelated. Ah @AA-Turner fixed the ruff configuration already...

[jfbu]

I tested with this index.rst

====
TEST
====

NOTICES
=======

.. note::

   This is a note

.. tip::

   This is a tip

.. hint::

   This is a hint

.. important::

   This is important

.. warning::

   This is a warning

and this in conf.py

latex_elements = {
  'passoptionstopackages': '\\PassOptionsToPackage{svgnames}{xcolor}',
  'preamble': r'''
\renewenvironment{sphinxnote}[1]{\begin{sphinxheavybox}\sphinxstrong{#1} }{\end{sphinxheavybox}}
\renewenvironment{sphinxhint}[1]{\begin{sphinxheavybox}\sphinxstrong{#1} }{\end{sphinxheavybox}}
\renewenvironment{sphinximportant}[1]{\begin{sphinxheavybox}\sphinxstrong{#1} }{\end{sphinxheavybox}}
\renewenvironment{sphinxtip}[1]{\begin{sphinxheavybox}\sphinxstrong{#1} }{\end{sphinxheavybox}}
\colorlet{sphinxnoteBgColor}{yellow}
\colorlet{sphinxtipBgColor}{yellow!10}
''',
  'sphinxsetup': r'''
       div.warning_border-width=3pt,
       div.warning_padding=6pt,
       div.warning_padding-right=18pt,
       div.warning_padding-bottom=18pt,
       div.warning_border-TeXcolor={named}{DarkCyan},
       div.warning_background-TeXcolor={named}{LightCyan},
       div.warning_box-shadow=-12pt -12pt inset,
       div.warning_box-shadow-TeXcolor={named}{Cyan},
       hintborder=3pt,
       hintBorderColor=red,
       noteborder=5pt,
       noteBorderColor=blue,
'''
}