Prepare 8.8.1 changelog (#2795) (#2811)

* consolidate changelog

Co-authored-by: David Kilfoyle <41695641+kilfoyle@users.noreply.github.com>
Co-authored-by: Pierre HILBERT <pierre.hilbert@elastic.co>
(cherry picked from commit 48ec62c)

Co-authored-by: Paolo Chilà <paolo.chila@elastic.co>

Author: mergify[bot]

changelog/8.8.1.asciidoc

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+// begin 8.8.1 relnotes
+
+[[release-notes-8.8.1]]
+==  8.8.1
+
+Review important information about the  8.8.1 release.
+
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+[discrete]
+[[bug-fixes-8.8.1]]
+=== Bug fixes
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+* Fix potential deadlock issue in communication between updated components and RuntimeManager. {-pull}https://github.com/elastic/elastic-agent/pull/2729[#https://github.com/elastic/elastic-agent/pull/2729] {-issue}https://github.com/elastic/elastic-agent/issues/2691[#https://github.com/elastic/elastic-agent/issues/2691]
+agent::
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+* Add a retry download step to the upgrade process. {agent-pull}https://github.com/elastic/elastic-agent/pull/2776[#https://github.com/elastic/elastic-agent/pull/2776] 
+
+// end 8.8.1 relnotes

changelog/8.8.1.yaml

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+version: 8.8.1
+entries:
+    - kind: bug-fix
+      summary: Fix deadlock condition in RuntimeManager
+      description: |
+        In some cases it was possible that a running component would lose connection to the Elastic Agent and
+        unable to re-connect because of a concurrent updated component model. With it being unable to re-connect
+        and the Elastic Agent unable to send it latest component model it results in the Elastic Agent hitting
+        a deadlock where it cannot run properly.
+      component: "agent"
+      pr:
+        - https://github.com/elastic/elastic-agent/pull/2729
+      issue:
+        - https://github.com/elastic/elastic-agent/issues/2691
+      timestamp: 1685029627
+      file:
+        name: 1685029627-Fix-deadlock-condition-in-RuntimeManager.yaml
+        checksum: 62f26a6fee8ea9756fe69f902bc7c366d5914f6a
+    - kind: bug-fix
+      summary: Retry download step in upgrade process
+      description: ""
+      component: agent
+      pr:
+        - https://github.com/elastic/elastic-agent/pull/2776
+      timestamp: 1685751999
+      file:
+        name: 1685751999-retry-download-step-in-upgrade-process.yaml
+        checksum: fc59952b01eafab2c1b36c7a164c0da2420b88a2