Update with_lock_retries helper keyword argument name

from `safe` to `raise_on_exhaustion`, in order to match what we pass to
Gitlab::Database::WithLockRetries.

db/post_migrate/20210622041846_finalize_push_event_payloads_bigint_conversion.rb

@@ -31,7 +31,7 @@ class FinalizePushEventPayloadsBigintConversion < ActiveRecord::Migration[6.1]
     # Duplicate fk_36c74129da FK
     add_concurrent_foreign_key TABLE_NAME, :events, column: :event_id_convert_to_bigint, on_delete: :cascade
 
-    with_lock_retries(safe: true) do
+    with_lock_retries(raise_on_exhaustion: true) do
       swap_column_names TABLE_NAME, :event_id, :event_id_convert_to_bigint # rubocop:disable Migration/WithLockRetriesDisallowedMethod
 
       # Swap defaults

lib/gitlab/database/migration_helpers.rb

@@ -389,7 +389,7 @@ module Gitlab
       # * +logger+ - [Gitlab::JsonLogger]
       # * +env+ - [Hash] custom environment hash, see the example with `DISABLE_LOCK_RETRIES`
       def with_lock_retries(*args, **kwargs, &block)
-        raise_on_exhaustion = !!kwargs.delete(:safe)
+        raise_on_exhaustion = !!kwargs.delete(:raise_on_exhaustion)
         merged_args = {
           klass: self.class,
           logger: Gitlab::BackgroundMigration::Logger

spec/lib/gitlab/database/migration_helpers_spec.rb

@@ -2160,10 +2160,7 @@ RSpec.describe Gitlab::Database::MigrationHelpers do
 
     using RSpec::Parameterized::TableSyntax
 
-    where(:safe, :raise_on_exhaustion) do
-      true       | true
-      false      | false
-    end
+    where(raise_on_exhaustion: [true, false])
 
     with_them do
       it 'sets raise_on_exhaustion as requested' do
@@ -2171,7 +2168,7 @@ RSpec.describe Gitlab::Database::MigrationHelpers do
         expect(Gitlab::Database::WithLockRetries).to receive(:new).and_return(with_lock_retries)
         expect(with_lock_retries).to receive(:run).with(raise_on_exhaustion: raise_on_exhaustion)
 
-        model.with_lock_retries(env: env, logger: in_memory_logger, safe: safe) { }
+        model.with_lock_retries(env: env, logger: in_memory_logger, raise_on_exhaustion: raise_on_exhaustion) { }
       end
     end