Prune changelogs after 8.11.4 release

docs/changelog/102843.yaml

@@ -1,5 +0,0 @@
-pr: 102843
-summary: Restore `SharedBytes.IO` refcounting on reads & writes
-area: Snapshot/Restore
-type: bug
-issues: []

docs/changelog/102848.yaml

@@ -1,5 +0,0 @@
-pr: 102848
-summary: Decref `SharedBytes.IO` after read is done not before
-area: Snapshot/Restore
-type: bug
-issues: []

docs/changelog/103003.yaml

@@ -1,6 +0,0 @@
-pr: 103003
-summary: "Fix: Watcher REST API `GET /_watcher/settings` now includes product header"
-area: "Watcher"
-type: bug
-issues:
- - 102928

docs/changelog/103151.yaml

@@ -1,6 +0,0 @@
-pr: 103151
-summary: Wrap painless explain error
-area: Infra/Scripting
-type: bug
-issues:
- - 103018

docs/changelog/103474.yaml

@@ -1,6 +0,0 @@
-pr: 103474
-summary: Fix now in millis for ESQL search contexts
-area: ES|QL
-type: bug
-issues:
- - 103455

docs/changelog/103611.yaml

@@ -1,6 +0,0 @@
-pr: 103611
-summary: Fix NPE on missing event queries
-area: EQL
-type: bug
-issues:
- - 103608

docs/changelog/103758.yaml

@@ -1,5 +0,0 @@
-pr: 103758
-summary: Fix the transport version of `PlanStreamOutput`
-area: ES|QL
-type: bug
-issues: []

docs/changelog/103865.yaml

@@ -1,5 +0,0 @@
-pr: 103865
-summary: Revert change
-area: Mapping
-type: bug
-issues: []