[PM-6125] Handle kp.alg is string (#10285)

* fix: handle cases when `kp.alg` is `string` in `createCredential` for `Fido2`

* feat: simplify and move fix to mappers

* fix null filter

---------

Co-authored-by: Alessio Cosenza <cosenzaalessio17@gmail.com>
Co-authored-by: Merissa Weinstein <merissa.k.weinstein@gmail.com>
Co-authored-by: Todd Martin <tmartin@bitwarden.com>

apps/browser/src/autofill/fido2/utils/webauthn-utils.ts

@@ -36,10 +36,13 @@ export class WebauthnUtils {
       extensions: {
         credProps: keyOptions.extensions?.credProps,
       },
-      pubKeyCredParams: keyOptions.pubKeyCredParams.map((params) => ({
-        alg: params.alg,
-        type: params.type,
-      })),
+      pubKeyCredParams: keyOptions.pubKeyCredParams
+        .map((params) => ({
+          // Fix for spec-deviation: Sites using KeycloakJS send `kp.alg` as a string
+          alg: Number(params.alg),
+          type: params.type,
+        }))
+        .filter((params) => !isNaN(params.alg)),
       rp: {
         id: keyOptions.rp.id,
         name: keyOptions.rp.name,