mgr/dashboard: [Dashboard] Incorrect action button label "Edit User" instead of ...

mgr/dashboard: [Dashboard] Incorrect action button label "Edit User" instead of "Save" in Edit User page

Fixes: https://tracker.ceph.com/issues/76507
Signed-off-by: pujaoshahu <pshahu@redhat.com>
Summary: Updated submit button labels in edit forms to display "Save" instead of "Edit User", "Edit Pool", or "Edit Host" for better UX consistency, while keeping form titles unchanged.

Modified Files
role-form.component.ts: Added submitAction property to control submit button label by mode; edit mode uses Save changes, create mode uses Create Role.

role-form.component.html: Submit button now binds to submitAction instead of action/resource text.

role-form.component.spec.ts: Added tests for submitAction behavior in create and edit modes.

user-form.component.ts: Uses submitAction property; edit mode label updated to Save changes.

user-form.component.html: Submit button uses submitAction binding.

user-form.component.spec.ts: Added/updated tests covering submitAction behavior.

pool-form.component.ts: Uses submitAction property; edit mode label updated to Save changes.

pool-form.component.html: Submit button uses submitAction binding.

pool-form.component.spec.ts: Updated submit label test expectation for edit mode.

hosts.component.ts: Edit host modal submit button text changed to Save changes.

hosts.component.spec.ts: Updated test to match Save changes button text.

app.constants.ts: In the current workspace snapshot, there is no SAVE constant added under ActionLabelsI18n.

Signed-off-by: pujaoshahu <pshahu@redhat.com>
Signed-off-by: pujashahu <pshahu@redhat.com>