Hide "All changes saved" when not yet saved, after 5 sec

What does this MR do and why?

Hide "All changes saved" when blank, after 5 sec

When creating a category, show "All changes saved" only after save
And hide it when no longer relevant, after five seconds like a toast

References

• epic: Security Attributes/Context Filtering (&18010)

Screenshots or screen recordings

Before	After
Screen_Recording_2025-10-20_at_20.08.53 All changes saved shows any time there are 0 changes	Screen_Recording_2025-10-20_at_20.06.53 All changes saved shows only when not blank and recently saved (within the last five seconds, like a toast)

How to set up and validate locally

git checkout mfluharty-hide-changes-saved-after-timeout
echo "Feature.enable(:security_categories_and_attributes)" | gdk rails c
echo "Feature.enable(:security_context_labels)" | gdk rails c

1. navigate to a top-level group that you're a maintainer for => Secure => Security configuration
2. create a new category - with the form in its blank state, All changes saved should not be shown

note: if this is the first category for the group, and you can't do so via the UI (Error when adding the first security attribute ... (#577206)):

expand for GraphQL mutation

in http://gdk.test:3000/-/graphql-explorer:

1. run this to get the namespace id of your top-level group (like "gid://gitlab/Group/24"):

{
  group(fullPath: "gitlab-org") { # replace this with the full path of your top-level group
    id
  }
}

2. run this to create a category for that group:

mutation {
  securityCategoryCreate(input: {
    namespaceId: "gid://gitlab/Group/24", # replace this with the id from step 1
    name: "category name",
    description: "category description",
    multipleSelection: true,
  }) {
    securityCategory {
      name
    }
    errors
  }
}

now you should be able to create more categories in this group via the UI 🎉

3. edit a category - you should see N unsaved changes next to the Save changes button at the bottom
4. save the category - you should see All changes saved next to the Save changes button for the next five seconds, then it should disappear

MR acceptance checklist

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