Run DRA steps for n.x branches as well (#5493) (#5502)

(cherry picked from commit 50fb426)

Co-authored-by: Shaunak Kashyap <ycombinator@gmail.com>

Author: mergify[bot]

.buildkite/pipeline.elastic-agent-binary-dra.yml

@@ -10,7 +10,7 @@ env:
 steps:
   - group: ":beats: DRA Elastic-Agent Core Snapshot :beats:"
     key: "dra-core-snapshot"
-    if: build.branch == 'main' || build.branch =~ /^[0-9]+\.[0-9]+\$/ || build.env("RUN_SNAPSHOT") == "true"
+    if: build.branch == 'main' || build.branch =~ /^[0-9]+\.[0-9x]+\$/ || build.env("RUN_SNAPSHOT") == "true"
     steps:
     - label: ":package: Build Elastic-Agent Core Snapshot"
       commands:
@@ -43,7 +43,7 @@ steps:
 
   - group: ":beats: DRA Elastic-Agent Core Staging :beats:"
     key: "dra-core-staging"
-    if: build.branch =~ /^[0-9]+\.[0-9]+\$/ || build.env("RUN_STAGING") == "true"
+    if: build.branch =~ /^[0-9]+\.[0-9x]+\$/ || build.env("RUN_STAGING") == "true"
     steps:
     - label: ":package: Build Elastic-Agent Core staging"
       commands: