Prompt user to reload page when SAML SSO session has expired

What does this MR do and why?

This change adds a modal in the group and project pages that prompts the user to reload the page if the SAML session has expired.

This is part #1. In part #2, we will dismiss the modal if the user has been re-authenticated in another window/tab.

EE: true

Related to: Inconsistent behavior for "resumed" SAML sessions (#419578 - closed)

Related to: Draft: Expire session from init (!138572)

MR acceptance checklist

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Screenshots or screen recordings

How to set up and validate locally

1. Configure Group SAML for a group, for example Flights and sign in - GDK howto guide
2. After 24 hours the modal will appear. To show the modal immediately use this patch:

diff --git a/ee/app/assets/javascripts/saml_sso/components/saml_reload_modal.vue b/ee/app/assets/javascripts/saml_sso/components/saml_reload_modal.vue
index 46832247d3a9..312a2f5afb9e 100644
--- a/ee/app/assets/javascripts/saml_sso/components/saml_reload_modal.vue
+++ b/ee/app/assets/javascripts/saml_sso/components/saml_reload_modal.vue
@@ -22,7 +22,7 @@ export default {
     };
   },
   async created() {
-    const session = await getExpiringSamlSession({ samlProviderId: this.samlProviderId });
+    const session = { timeRemaingMs: 1000 };
 
     if (session) {
       setTimeout(() => {