Enable ActiveContext

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Context

Update initializer

diff --git a/config/initializers/active_context.rb b/config/initializers/active_context.rb
index 43fa3daa1894..d4a5678d0805 100644
--- a/config/initializers/active_context.rb
+++ b/config/initializers/active_context.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 ActiveContext.configure do |config|
-  config.enabled = false
-  config.indexing_enabled = false
+  config.enabled = true
+  config.indexing_enabled = true
   config.logger = ::Gitlab::ActiveContext::Logger.build
 end

Update documentation for logging

Reference: https://docs.gitlab.com/development/logging/#additional-steps-with-new-log-files

Update Administration docs

We also need to add a section about the activecontext.log to the documentation. See !197897 (comment 2632785602) and !197897 (comment 2632823995)

Update runbook

Runbook link