build: stop suffixing XModule SCSS with hashes

Similar to openedx#32287,
this change removes another unnecessary step from the
`xmodule_assets` script. The script, which generates XModule
SCSS "entrypoint" files (synthesizing one or more "source" SCSS
resources), was appending MD5 hashes to each SCSS entrypoint filename:

    common/static/xmodule/descriptors/scss:
       AboutBlockStudio.768623f4d8d73dfb637fc94583adb990.scss
       AnnotatableBlockStudio.be69909d83985d31e206fad272906958.scss
       ConditionalBlockStudio.d41d8cd98f00b204e9800998ecf8427e.scss
       CourseInfoBlockStudio.768623f4d8d73dfb637fc94583adb990.scss
       CustomTagBlockStudio.be69909d83985d31e206fad272906958.scss
       HtmlBlockStudio.768623f4d8d73dfb637fc94583adb990.scss
       LibraryContentBlockStudio.d41d8cd98f00b204e9800998ecf8427e.scss
       LTIBlockStudio.d41d8cd98f00b204e9800998ecf8427e.scss
       PollBlockStudio.d41d8cd98f00b204e9800998ecf8427e.scss
       ProblemBlockStudio.5893b30426f88e14712556c6c4342f23.scss
       SequenceBlockStudio.d41d8cd98f00b204e9800998ecf8427e.scss
       SplitTestBlockStudio.d41d8cd98f00b204e9800998ecf8427e.scss
       StaticTabBlockStudio.768623f4d8d73dfb637fc94583adb990.scss
       VideoBlockStudio.e4a6920a875dfb91eb65ee7e6dad7e2e.scss
       WordCloudBlockStudio.d41d8cd98f00b204e9800998ecf8427e.scss
    common/static/xmodule/modules/scss:
       AboutBlockPreview.05a6cbd5c10100a245fa2cbf151b9770.scss
       AnnotatableBlockPreview.7e95b106aa0a61824f4290da1374960d.scss
       ConditionalBlockPreview.d41d8cd98f00b204e9800998ecf8427e.scss
       CourseInfoBlockPreview.05a6cbd5c10100a245fa2cbf151b9770.scss
       CustomTagBlockPreview.d41d8cd98f00b204e9800998ecf8427e.scss
       HtmlBlockPreview.05a6cbd5c10100a245fa2cbf151b9770.scss
       LibraryContentBlockPreview.d41d8cd98f00b204e9800998ecf8427e.scss
       LTIBlockPreview.a763928b2c415251720f8634b8daee59.scss
       PollBlockPreview.39730e54c1eebbafd18a82fbb09c1e37.scss
       ProblemBlockPreview.70b905ac161108a0a03c639232450aaa.scss
       SequenceBlockPreview.e2336fa64ba495fa7c0f4f838d20ad8c.scss
       SplitTestBlockPreview.d41d8cd98f00b204e9800998ecf8427e.scss
       StaticTabBlockPreview.05a6cbd5c10100a245fa2cbf151b9770.scss
       VideoBlockPreview.b2de5e1c4da8cba16ce1c4bdeab50f9e.scss
       WordCloudBlockPreview.7b899a56a70d29c58cf14b7e1888a0ec.scss

It's unclear why these MD5 hashes needed to be appended.
A comment in xmodule/static_content.py hints that it might have
something to do with de-duplication, but that doesn't make any sense,
because each XModule has exactly two SCSS entrypoint files (one for
studio_view and one for other student/author_views) and none of those
entrypoint files can possibly be shared between XModules.

Soon, as part of deleting the `xmodule_assets` script,
we would like to just check these SCSS files into version control
rather than generating them. In order to do that, we will need to
drop the hashes.

So, in the interest of isolating changes in hard-to-test subsystems,
this change simply drops the MD5 hashes from the generated SCSS
filenames. The new output looks like this:

    common/static/xmodule/descriptors:
       AboutBlockStudio.scss
       AnnotatableBlockStudio.scss
       ConditionalBlockStudio.scss
       CourseInfoBlockStudio.scss
       CustomTagBlockStudio.scss
       HtmlBlockStudio.scss
       LibraryContentBlockStudio.scss
       LTIBlockStudio.scss
       PollBlockStudio.scss
       ProblemBlockStudio.scss
       SequenceBlockStudio.scss
       SplitTestBlockStudio.scss
       StaticTabBlockStudio.scss
       VideoBlockStudio.scss
       WordCloudBlockStudio.scss
    common/static/xmodule/modules:
       AboutBlockPreview.scss
       AnnotatableBlockPreview.scss
       ConditionalBlockPreview.scss
       CourseInfoBlockPreview.scss
       CustomTagBlockPreview.scss
       HtmlBlockPreview.scss
       LibraryContentBlockPreview.scss
       LTIBlockPreview.scss
       PollBlockPreview.scss
       ProblemBlockPreview.scss
       SequenceBlockPreview.scss
       SplitTestBlockPreview.scss
       StaticTabBlockPreview.scss
       VideoBlockPreview.scss
       WordCloudBlockPreview.scss

Part of: openedx#31624

xmodule/static_content.py

@@ -147,9 +147,8 @@ def _write_styles(selector, output_root, classes, css_attribute, suffix):
         ))
         module_styles_lines.extend(f'  @import "{name}";' for name in fragment_names)
         module_styles_lines.append('}')
-        file_hash = hashlib.md5("".join(fragment_names).encode('ascii')).hexdigest()
 
-        contents[f"{class_.__name__}{suffix}.{file_hash}.scss"] = '\n'.join(module_styles_lines)
+        contents[f"{class_.__name__}{suffix}.scss"] = '\n'.join(module_styles_lines)
 
     _write_files(output_root, contents)
 

xmodule/util/xmodule_django.py

@@ -61,9 +61,9 @@ def load_assets(self):
                             'path': '/openedx/edx-platform/common/static/bundles/AnnotatableBlockPreview.js.map'
                         },
                         {
-                            'name': 'AnnotatableBlockPreview.85745121.css',
-                            'path': 'common/static/css/xmodule/AnnotatableBlockPreview.85745121.css',
-                            'publicPath': '/static/css/xmodule/AnnotatableBlockPreview.85745121.css'
+                            'name': 'AnnotatableBlockPreview.css',
+                            'path': 'common/static/css/xmodule/AnnotatableBlockPreview.css',
+                            'publicPath': '/static/css/xmodule/AnnotatableBlockPreview.css'
                         }
                     ],
                     ...