Exclude build dependency calculation when creating the pipeline

This will help us to reduce the number of queries for creating
the pipeline.

app/models/ci/build_dependencies.rb

@@ -17,6 +17,7 @@ module Ci
     # Dependencies local to the given pipeline
     def local
       return [] if no_local_dependencies_specified?
+      return [] unless processable.pipeline_id # we don't have any dependency when creating the pipeline
 
       deps = model_class.where(pipeline_id: processable.pipeline_id).latest
       deps = from_previous_stages(deps)

changelogs/unreleased/326475-exclude-dependency-calculation-when-creating-pipeline.yml

+---
+title: Exclude build dependency calculation when creating the pipeline
+merge_request: 59810
+author:
+type: performance

spec/lib/gitlab/ci/pipeline/chain/seed_spec.rb

@@ -259,15 +259,10 @@ RSpec.describe Gitlab::Ci::Pipeline::Chain::Seed do
 
       def expected_extra_queries
         extra_jobs = 2
-        non_handled_sql_queries = 3
-
-        # 1. Ci::Build Load () SELECT "ci_builds".* FROM "ci_builds"
-        #                      WHERE "ci_builds"."type" = 'Ci::Build'
-        #                        AND "ci_builds"."commit_id" IS NULL
-        #                        AND ("ci_builds"."retried" = FALSE OR "ci_builds"."retried" IS NULL)
-        #                        AND (stage_idx < 1)
-        # 2. Ci::InstanceVariable Load => `Ci::InstanceVariable#cached_data` => already cached with `fetch_memory_cache`
-        # 3. Ci::Variable Load => `Project#ci_variables_for` => already cached with `Gitlab::SafeRequestStore`
+        non_handled_sql_queries = 2
+
+        # 1. Ci::InstanceVariable Load => `Ci::InstanceVariable#cached_data` => already cached with `fetch_memory_cache`
+        # 2. Ci::Variable Load => `Project#ci_variables_for` => already cached with `Gitlab::SafeRequestStore`
 
         extra_jobs * non_handled_sql_queries
       end