Use AppLogger in lib/gitlab/

This MR adds AppLogger in lib/gitlab
and adds changelog for the change

Add changelog

Fix spec failures and change changelog type

Remove AppLogger from geo logger

changelogs/unreleased/app-logger-6.yml

+---
+title: Use applogger in lib/gitlab/
+merge_request: 41052
+author: Rajendra Kadam
+type: other

ee/lib/gitlab/database/load_balancing/service_discovery.rb

@@ -61,7 +61,7 @@ module Gitlab
                   # Sentry, instead of silently terminating this thread.
                   Raven.capture_exception(error)
 
-                  Rails.logger.error( # rubocop:disable Gitlab/RailsLogger
+                  Gitlab::AppLogger.error(
                     "Service discovery encountered an error: #{error.message}"
                   )
 

ee/lib/pseudonymizer/dumper.rb

@@ -59,7 +59,7 @@ module Pseudonymizer
                            pseudonymity_columns)
       )
     rescue => e
-      Rails.logger.error("Failed to export #{table}: #{e}") # rubocop:disable Gitlab/RailsLogger
+      Gitlab::AppLogger.error("Failed to export #{table}: #{e}")
       raise e
     end
 
@@ -115,7 +115,7 @@ module Pseudonymizer
       file_path = output_filename(table)
       headers = contents.peek.keys
 
-      Rails.logger.info "#{self.class.name} writing #{table} to #{file_path}." # rubocop:disable Gitlab/RailsLogger
+      Gitlab::AppLogger.info "#{self.class.name} writing #{table} to #{file_path}."
       Zlib::GzipWriter.open(file_path) do |io|
         csv = CSV.new(io, headers: headers, write_headers: true)
         contents.each { |row| csv << row.values }
@@ -123,7 +123,7 @@ module Pseudonymizer
 
       file_path
     rescue StopIteration
-      Rails.logger.info "#{self.class.name} table #{table} is empty." # rubocop:disable Gitlab/RailsLogger
+      Gitlab::AppLogger.info "#{self.class.name} table #{table} is empty."
       nil
     end
   end

ee/lib/pseudonymizer/filter.rb

@@ -33,7 +33,7 @@ module Pseudonymizer
 
       pseudo_extra_fields = pseudonymized - whitelisted
       pseudo_extra_fields.each do |field|
-        Rails.logger.warn("#{self.class.name} extraneous pseudo: #{@table}.#{field} is not whitelisted and will be ignored.") # rubocop:disable Gitlab/RailsLogger
+        Gitlab::AppLogger.warn("#{self.class.name} extraneous pseudo: #{@table}.#{field} is not whitelisted and will be ignored.")
       end
 
       pseudonymized & whitelisted

ee/spec/lib/pseudonymizer/dumper_spec.rb

@@ -95,7 +95,7 @@ RSpec.describe Pseudonymizer::Dumper do
           }
         }
 
-        expect(Rails.logger).to receive(:warn).with(/extraneous/)
+        expect(Gitlab::AppLogger).to receive(:warn).with(/extraneous/)
 
         pseudo.tables_to_csv
       end