Increase reindexing timeout to 24 hours

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/345134

lib/gitlab/database/reindexing/reindex_concurrently.rb

@@ -8,7 +8,7 @@ module Gitlab
         ReindexError = Class.new(StandardError)
 
         TEMPORARY_INDEX_PATTERN = '\_ccnew[0-9]*'
-        STATEMENT_TIMEOUT = 9.hours
+        STATEMENT_TIMEOUT = 24.hours
         PG_MAX_INDEX_NAME_LENGTH = 63
 
         attr_reader :index, :logger

spec/lib/gitlab/database/reindexing/reindex_concurrently_spec.rb

@@ -62,7 +62,7 @@ RSpec.describe Gitlab::Database::Reindexing::ReindexConcurrently, '#perform' do
 
   it 'recreates the index using REINDEX with a long statement timeout' do
     expect_to_execute_in_order(
-      "SET statement_timeout TO '32400s'",
+      "SET statement_timeout TO '86400s'",
       "REINDEX INDEX CONCURRENTLY \"public\".\"#{index.name}\"",
       "RESET statement_timeout"
     )
@@ -84,7 +84,7 @@ RSpec.describe Gitlab::Database::Reindexing::ReindexConcurrently, '#perform' do
       it 'drops the dangling indexes while controlling lock_timeout' do
         expect_to_execute_in_order(
           # Regular index rebuild
-          "SET statement_timeout TO '32400s'",
+          "SET statement_timeout TO '86400s'",
           "REINDEX INDEX CONCURRENTLY \"public\".\"#{index_name}\"",
           "RESET statement_timeout",
           # Drop _ccnew index