Remove the CI parts mentioning 8.17.11 (elastic#133545)

This is follow up of the elastic#133531

Author: jozala

.buildkite/pipelines/intake.yml

@@ -65,7 +65,7 @@ steps:
         timeout_in_minutes: 300
         matrix:
           setup:
-            BWC_VERSION: ["8.17.11", "8.18.6", "8.19.3", "9.0.6", "9.1.3"]
+            BWC_VERSION: ["8.18.6", "8.19.3", "9.0.6", "9.1.3"]
         agents:
           provider: gcp
           image: family/elasticsearch-ubuntu-2404

.buildkite/pipelines/periodic-packaging.yml

@@ -302,8 +302,8 @@ steps:
         env:
           BWC_VERSION: 8.16.6
 
-      - label: "{{matrix.image}} / 8.17.11 / packaging-tests-upgrade"
-        command: ./.ci/scripts/packaging-test.sh -Dbwc.checkout.align=true destructiveDistroUpgradeTest.v8.17.11
+      - label: "{{matrix.image}} / 8.17.10 / packaging-tests-upgrade"
+        command: ./.ci/scripts/packaging-test.sh -Dbwc.checkout.align=true destructiveDistroUpgradeTest.v8.17.10
         timeout_in_minutes: 300
         matrix:
           setup:
@@ -316,7 +316,7 @@ steps:
           machineType: custom-16-32768
           buildDirectory: /dev/shm/bk
         env:
-          BWC_VERSION: 8.17.11
+          BWC_VERSION: 8.17.10
 
       - label: "{{matrix.image}} / 8.18.6 / packaging-tests-upgrade"
         command: ./.ci/scripts/packaging-test.sh -Dbwc.checkout.align=true destructiveDistroUpgradeTest.v8.18.6

.buildkite/pipelines/periodic.yml

@@ -325,8 +325,8 @@ steps:
             - signal_reason: agent_stop
               limit: 3
 
-      - label: 8.17.11 / bwc
-        command: .ci/scripts/run-gradle.sh -Dbwc.checkout.align=true v8.17.11#bwcTest
+      - label: 8.17.10 / bwc
+        command: .ci/scripts/run-gradle.sh -Dbwc.checkout.align=true v8.17.10#bwcTest
         timeout_in_minutes: 300
         agents:
           provider: gcp
@@ -335,7 +335,7 @@ steps:
           buildDirectory: /dev/shm/bk
           preemptible: true
         env:
-          BWC_VERSION: 8.17.11
+          BWC_VERSION: 8.17.10
         retry:
           automatic:
             - exit_status: "-1"
@@ -487,7 +487,7 @@ steps:
           setup:
             ES_RUNTIME_JAVA:
               - openjdk21
-            BWC_VERSION: ["8.17.11", "8.18.6", "8.19.3", "9.0.6", "9.1.3"]
+            BWC_VERSION: ["8.18.6", "8.19.3", "9.0.6", "9.1.3"]
         agents:
           provider: gcp
           image: family/elasticsearch-ubuntu-2404
@@ -531,7 +531,7 @@ steps:
             ES_RUNTIME_JAVA:
               - openjdk21
               - openjdk23
-            BWC_VERSION: ["8.17.11", "8.18.6", "8.19.3", "9.0.6", "9.1.3"]
+            BWC_VERSION: ["8.18.6", "8.19.3", "9.0.6", "9.1.3"]
         agents:
           provider: gcp
           image: family/elasticsearch-ubuntu-2404

.ci/bwcVersions

@@ -16,7 +16,7 @@ BWC_VERSION:
   - "8.14.3"
   - "8.15.5"
   - "8.16.6"
-  - "8.17.11"
+  - "8.17.10"
   - "8.18.6"
   - "8.19.3"
   - "9.0.6"

.ci/snapshotBwcVersions

@@ -1,5 +1,4 @@
 BWC_VERSION:
-  - "8.17.11"
   - "8.18.6"
   - "8.19.3"
   - "9.0.6"