Revert "bk: run faster builds" (#7038)

* Revert "bk: run faster builds (#7029)"

This reverts commit ded8d0a.

* Revert "fix(ci): unshallow repo before merge in post-checkout hook (#7037)"

This reverts commit 76e5002.

---------

Co-authored-by: ebeahan <eric.beahan@elastic.co>
Co-authored-by: Michel Laterman <82832767+michel-laterman@users.noreply.github.com>

Author: 3 people

.buildkite/hooks/post-checkout

@@ -24,10 +24,6 @@ checkout_merge() {
     git config user.name "github-merged-pr-post-checkout"
     git config user.email "auto-merge@buildkite"
 
-    # sparse-checkout creates a shallow clone without full commit history;
-    # unshallow so git can find the common ancestor needed for the merge
-    git fetch --unshallow 2>/dev/null || true
-
     git merge --no-edit "${BUILDKITE_COMMIT}" || {
         local merge_result=$?
         echo "Merge failed: ${merge_result}"

catalog-info.yaml

@@ -44,12 +44,6 @@ spec:
     spec:
       repository: elastic/fleet-server
       pipeline_file: ".buildkite/pipeline.yml"
-      initial_step_plugins:
-        - sparse-checkout#v1.6.0:
-            paths:
-              - .buildkite
-              - .go-version
-            cleanup_sparse_state: true
       # patterns for tags are required to trigger the step that publishes the docker.elastic.co/package-registry/distribution images
       # step with key: "release-package-registry"
       branch_configuration: "main 9.* 8.* 7.* v9.* v8.* v7.*"
@@ -102,12 +96,6 @@ spec:
     spec:
       repository: elastic/fleet-server
       pipeline_file: ".buildkite/pipeline.package.mbp.yml"
-      initial_step_plugins:
-        - sparse-checkout#v1.6.0:
-            paths:
-              - .buildkite
-              - .go-version
-            cleanup_sparse_state: true
       provider_settings:
         build_pull_request_forks: false
         build_pull_requests: true