Implement all trusted sinks in HTMLScriptElement (#36668)

As a follow-up to the recent introduction of `script.src`
as trusted sink, this PR refactors machinery to also
support `TrustedScript`. In doing so, all trusted sinks
in `HTMLScriptElement` are now covered.

Instead of calling the callbacks in `policy.createX`,
we now have a `TrustedType` enum that specifies which callback
to invoke. Unfortunately we still have the `USVString` vs
`DOMString` problem, which is why we need to `.map` twice
to retrieve the backing `String` and avoid two different
types.

Additionally, I saw that `script.text` should have called
the "String replace all" algorithm rather than setting the
child contents. So that's also now fixed.

Part of #36258
Requires servo/html5ever#608

Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>

Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>

components/script/dom/trustedscript.rs

@@ -1,14 +1,19 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+use std::fmt;
 
 use dom_struct::dom_struct;
 
 use crate::dom::bindings::codegen::Bindings::TrustedScriptBinding::TrustedScriptMethods;
+use crate::dom::bindings::codegen::UnionTypes::TrustedScriptOrString;
+use crate::dom::bindings::error::Fallible;
 use crate::dom::bindings::reflector::{Reflector, reflect_dom_object};
 use crate::dom::bindings::root::DomRoot;
 use crate::dom::bindings::str::DOMString;
 use crate::dom::globalscope::GlobalScope;
+use crate::dom::trustedtypepolicy::TrustedType;
+use crate::dom::trustedtypepolicyfactory::TrustedTypePolicyFactory;
 use crate::script_runtime::CanGc;
 
 #[dom_struct]
@@ -30,6 +35,37 @@ impl TrustedScript {
     pub(crate) fn new(data: String, global: &GlobalScope, can_gc: CanGc) -> DomRoot<Self> {
         reflect_dom_object(Box::new(Self::new_inherited(data)), global, can_gc)
     }
+
+    pub(crate) fn get_trusted_script_compliant_string(
+        global: &GlobalScope,
+        value: TrustedScriptOrString,
+        containing_class: &str,
+        field: &str,
+        can_gc: CanGc,
+    ) -> Fallible<String> {
+        match value {
+            TrustedScriptOrString::String(value) => {
+                let sink = format!("{} {}", containing_class, field);
+                TrustedTypePolicyFactory::get_trusted_type_compliant_string(
+                    TrustedType::TrustedScript,
+                    global,
+                    value.as_ref().to_owned(),
+                    &sink,
+                    "'script'",
+                    can_gc,
+                )
+            },
+
+            TrustedScriptOrString::TrustedScript(trusted_script) => Ok(trusted_script.to_string()),
+        }
+    }
+}
+
+impl fmt::Display for TrustedScript {
+    #[inline]
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.write_str(&self.data)
+    }
 }
 
 impl TrustedScriptMethods<crate::DomTypeHolder> for TrustedScript {