[CI] Drop duplicate lint check (#158259)

## Summary

Noticed a duplicate lint check in a
[pr](https://buildkite.com/elastic/kibana-pull-request/builds/129550#01884877-20a5-4b7d-a395-9bd70bac3f75)
I was working on.
Considering what this check does, we prolly really do not want to run it
twice, unless this was not a mistake.

.buildkite/scripts/steps/checks.sh

@@ -6,7 +6,6 @@ export DISABLE_BOOTSTRAP_VALIDATION=false
 .buildkite/scripts/bootstrap.sh
 
 .buildkite/scripts/steps/checks/precommit_hook.sh
-.buildkite/scripts/steps/checks/packages.sh
 .buildkite/scripts/steps/checks/ts_projects.sh
 .buildkite/scripts/steps/checks/packages.sh
 .buildkite/scripts/steps/checks/bazel_packages.sh
@@ -22,4 +21,4 @@ export DISABLE_BOOTSTRAP_VALIDATION=false
 .buildkite/scripts/steps/checks/test_projects.sh
 .buildkite/scripts/steps/checks/test_hardening.sh
 .buildkite/scripts/steps/checks/ftr_configs.sh
-.buildkite/scripts/steps/checks/saved_objects_compat_changes.sh
+.buildkite/scripts/steps/checks/saved_objects_compat_changes.sh