Fix datatype validation of newly built collection

We only request the summary view when polling the history for updates,
so we don't serialize elements_datatypes, which is used to make sure
that the dragged element is of the correct datatype.

This probably fixes https://sentry.galaxyproject.org/share/issue/790be09602694a638d66257004325163/:
```
Message
(60007760) Failure preparing job
Stack Trace

Newest

NotFound: cannot find 'ext'
  File "galaxy/util/template.py", line 87, in fill_template
    return unicodify(t, log_exception=False)
  File "galaxy/util/__init__.py", line 1183, in unicodify
    value = str(value)
  File "Cheetah/Template.py", line 1053, in __unicode__
    return getattr(self, mainMethName)()
  File "cheetah_DynamicallyCompiledCheetahTemplate_1724455756_31925_91921.py", line 102, in respond
```

where a user provided a collection of HTML elements into a fasta/fastq
input. This is the only way I can think of where the validation would
fail.

client/src/api/schema/schema.ts

@@ -6580,6 +6580,11 @@ export interface components {
              * @description The number of elements contained in the dataset collection. It may be None or undefined if the collection could not be populated.
              */
             element_count?: number | null;
+            /**
+             * Elements Datatypes
+             * @description A set containing all the different element datatypes in the collection.
+             */
+            elements_datatypes: string[];
             /**
              * HID
              * @description The index position of this item in the History.

lib/galaxy/schema/schema.py

@@ -1104,6 +1104,9 @@ class HDCASummary(HDCACommon, WithModelClass):
     populated_state: DatasetCollectionPopulatedState = PopulatedStateField
     populated_state_message: Optional[str] = PopulatedStateMessageField
     element_count: ElementCountField
+    elements_datatypes: Set[str] = Field(
+        ..., description="A set containing all the different element datatypes in the collection."
+    )
     job_source_id: Optional[EncodedDatabaseIdField] = Field(
         None,
         title="Job Source ID",
@@ -1128,9 +1131,6 @@ class HDCADetailed(HDCASummary):
 
     populated: PopulatedField
     elements: List[DCESummary] = ElementsField
-    elements_datatypes: Set[str] = Field(
-        ..., description="A set containing all the different element datatypes in the collection."
-    )
     implicit_collection_jobs_id: Optional[EncodedDatabaseIdField] = Field(
         None,
         description="Encoded ID for the ICJ object describing the collection of jobs corresponding to this collection",