Reset cached secrets on Rails 7.0

Partial Revert of ManageIQ#23254

Enhanced the test to check both the app config secret_key_base and app
secret_key_base as there's caches in both.  These test changes make the
test fail if we do not clear the cached secrets on Rails 7.0.

app/models/mixins/miq_web_server_worker_mixin.rb

@@ -32,6 +32,11 @@ def configure_secret_token(token = MiqDatabase.first.session_secret_token)
       return if Rails.application.config.secret_key_base
 
       Rails.application.config.secret_key_base = token
+
+      # To set a secret token after the Rails.application is initialized,
+      # we need to reset the secrets since they are cached:
+      # https://github.com/rails/rails/blob/7-0-stable/railties/lib/rails/application.rb#L392-L404
+      Rails.application.secrets = nil if Rails.version < "7.1"
     end
 
     def rails_server

spec/models/mixins/miq_web_server_worker_mixin_spec.rb

@@ -15,20 +15,20 @@
   end
 
   before do
-    @token = Rails.application.config.secret_key_base
-    @credentials = Rails.application.credentials
+    @token = Rails.application.secret_key_base
     MiqDatabase.seed
   end
 
   after do
     Rails.application.config.secret_key_base = @token
-    Rails.application.credentials = @credentials
+    Rails.application.secrets = nil if Rails.version < "7.1"
   end
 
   it ".configure_secret_token defaults to MiqDatabase session_secret_token" do
     Rails.application.config.secret_key_base = nil
 
     test_class.configure_secret_token
+    expect(Rails.application.secret_key_base).to eq(MiqDatabase.first.session_secret_token)
     expect(Rails.application.config.secret_key_base).to eq(MiqDatabase.first.session_secret_token)
   end
 
@@ -37,16 +37,17 @@
 
     token = SecureRandom.hex(64)
     test_class.configure_secret_token(token)
+    expect(Rails.application.secret_key_base).to eq(token)
     expect(Rails.application.config.secret_key_base).to eq(token)
   end
 
   it ".configure_secret_token does not reset secrets when token already configured" do
     existing_value = SecureRandom.hex(64)
     Rails.application.config.secret_key_base = existing_value
-    Rails.application.credentials = nil
-    Rails.application.credentials
+    Rails.application.secrets = nil if Rails.version < "7.1"
 
     test_class.configure_secret_token
+    expect(Rails.application.secret_key_base).to eq(existing_value)
     expect(Rails.application.config.secret_key_base).to eq(existing_value)
   end