Bugfix/combobox disable autocomplete in firefox on android (#3201)

* Disable autocomplete in Combobox to "fix" issue where autocomplete is broken in Firefox on Android

The bug is that after three "correct" characters are entered in a row, the autocomplete inserts the third character incorrectly, messing up the text in the input.
This also happens in other implementations of autocomple, like W3C's ARIA Authoring Practices Guide combobox with inline autocomple.

* Add changeset

* Use type checking instead of useEffect to prevent client code from running server side

.changeset/rotten-moons-build.md

@@ -0,0 +1,5 @@
+---
+"@navikt/ds-react": patch
+---
+
+Combobox: Disable autocomple in Firefox on Android to prevent bug

@navikt/core/react/src/form/combobox/ComboboxProvider.tsx

@@ -51,13 +51,21 @@ const ComboboxProvider = forwardRef<HTMLInputElement, ComboboxProps>(
       value,
       onChange,
       onClear,
-      shouldAutocomplete,
+      shouldAutocomplete: externalShouldAutocomplete,
       size,
       ...rest
     } = props;
     const options = mapToComboboxOptionArray(externalOptions) || [];
     const filteredOptions = mapToComboboxOptionArray(externalFilteredOptions);
     const selectedOptions = mapToComboboxOptionArray(externalSelectedOptions);
+
+    const userAgent =
+      typeof navigator === "undefined" ? "" : navigator.userAgent;
+    const isFirefoxOnAndroid =
+      userAgent.includes("Android") && userAgent.includes("Firefox/");
+    const shouldAutocomplete =
+      !isFirefoxOnAndroid && externalShouldAutocomplete;
+
     return (
       <InputContextProvider
         value={{