script: Ensure notify_invalidations() is always called when modifying stylesheets (#38530)

This change supplements the missing stylesheet invalidation
notifications to fix some bugs that the modification of stylesheet does
not take effect. Additionally, this PR add a RAII thing to mark the
modification scope of stylesheet rules, which will facilitate to add
extra logic before the modification happens.

Fixes: there is relevant issue #38211 , but it can't be fixed by this
PR.
Testing: This fixes some subtests in
`/css/cssom/CSSStyleSheet-constructable.html`.

Signed-off-by: sharpshooter_pt <ibluegalaxy_taoj@163.com>

components/script/dom/cssstyledeclaration.rs

@@ -125,8 +125,6 @@ impl CSSStyleOwner {
                     f(&mut *pdb.write_with(&mut guard), &mut changed)
                 };
                 if changed {
-                    // If this is changed, see also
-                    // CSSStyleRule::SetSelectorText, which does the same thing.
                     rule.parent_stylesheet().notify_invalidations();
                 }
                 result