minor #29654 [Twig] Replace for-loops with blocks for attributes (royklutman)

This PR was squashed before being merged into the 3.4 branch (closes #29654).

Discussion
----------

[Twig] Replace for-loops with blocks for attributes

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   |
| Fixed tickets |
| License       | MIT
| Doc PR        |

As mentioned in #29636, replaced for-loops with blocks for attributes to make use of its features.

Commits
-------

0cd8088a6d [Twig] Replace for-loops with blocks for attributes

src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_3_layout.html.twig

@@ -98,7 +98,7 @@
                 {% set label = name|humanize %}
             {%- endif -%}
         {%- endif -%}
-        <label{% for attrname, attrvalue in label_attr %} {{ attrname }}="{{ attrvalue }}"{% endfor %}>
+        <label{% with { attr: label_attr } %}{{ block('attributes') }}{% endwith %}>
             {{- widget|raw }} {{ label is not same as(false) ? (translation_domain is same as(false) ? label : label|trans({}, translation_domain)) -}}
         </label>
     {%- endif -%}

src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_4_layout.html.twig

@@ -248,7 +248,7 @@
         {%- endif -%}
 
         {{ widget|raw }}
-        <label{% for attrname, attrvalue in label_attr %} {{ attrname }}="{{ attrvalue }}"{% endfor %}>
+        <label{% with { attr: label_attr } %}{{ block('attributes') }}{% endwith %}>
             {{- label is not same as(false) ? (translation_domain is same as(false) ? label : label|trans({}, translation_domain)) -}}
             {{- form_errors(form) -}}
         </label>

src/Symfony/Bridge/Twig/Resources/views/Form/form_div_layout.html.twig

@@ -327,7 +327,7 @@
     {%- else -%}
         {% set form_method = "POST" %}
     {%- endif -%}
-    <form{% if name != '' %} name="{{ name }}"{% endif %} method="{{ form_method|lower }}"{% if action != '' %} action="{{ action }}"{% endif %}{% for attrname, attrvalue in attr %} {{ attrname }}="{{ attrvalue }}"{% endfor %}{% if multipart %} enctype="multipart/form-data"{% endif %}>
+    <form{% if name != '' %} name="{{ name }}"{% endif %} method="{{ form_method|lower }}"{% if action != '' %} action="{{ action }}"{% endif %}{{ block('attributes') }}{% if multipart %} enctype="multipart/form-data"{% endif %}>
     {%- if form_method != method -%}
         <input type="hidden" name="_method" value="{{ method }}" />
     {%- endif -%}

src/Symfony/Bridge/Twig/Resources/views/Form/foundation_5_layout.html.twig

@@ -258,7 +258,7 @@
             {% set label = name|humanize %}
         {%- endif -%}
     {% endif %}
-    <label{% for attrname, attrvalue in label_attr %} {{ attrname }}="{{ attrvalue }}"{% endfor %}>
+    <label{% with { attr: label_attr } %}{{ block('attributes') }}{% endwith %}>
         {{ widget|raw }}
         {{ translation_domain is same as(false) ? label : label|trans({}, translation_domain) }}
     </label>