[8.5](backport #1244) Convert CHANGELOG.next to fragments (#1522)

* Convert CHANGELOG.next to fragments (#1244)

(cherry picked from commit 6eadeef)

# Conflicts:
#	CHANGELOG.next.asciidoc
#	README.md

* Fix merge conflict.

* Remove obsolete changelog.next

Co-authored-by: Edoardo Tenani <526307+endorama@users.noreply.github.com>
Co-authored-by: Craig MacKenzie <craig.mackenzie@elastic.co>

README.md

@@ -10,7 +10,8 @@ in the [observability-docs](https://github.com/elastic/observability-docs) repo.
 Prerequisites:
 - installed [mage](https://github.com/magefile/mage)
 - [Docker](https://docs.docker.com/get-docker/)
-- [X-pack](https://github.com/elastic/beats/tree/8.5/x-pack) to pre-exist in the parent folder of the local Git repository checkout
+- [X-pack](https://github.com/elastic/beats/tree/main/x-pack) to pre-exist in the parent folder of the local Git repository checkout
+- [elastic-agent-changelog-tool](https://github.com/elastic/elastic-agent-changelog-tool) to add changelog fragments for changelog generation
 
 If you are on a Mac with M1 chip, don't forget to export some docker variable to be able to build for AMD
 ```

changelog/fragments/1660139385-Fix-a-panic-caused-by-a-race-condition-when-installing-the-Elastic-Agent.yaml

@@ -0,0 +1,3 @@
+kind: bug-fix
+summary: Fix a panic caused by a race condition when installing the Elastic Agent.
+pr: https://github.com/elastic/elastic-agent/pull/823

changelog/fragments/1660158319-Upgrade-to-Go-118-Certificates-signed-with-SHA-1-are-now-rejected-See-the-Go-118.yaml

@@ -0,0 +1,3 @@
+kind: breaking-change
+summary: Upgrade to Go 1.18. Certificates signed with SHA-1 are now rejected. See the Go 1.18 https//tip.golang.org/doc/go1.18#sha1[release notes] for details.
+pr: https://github.com/elastic/elastic-agent/pull/832

changelog/fragments/1661188787-Add-lumberjack-input-type-to-the-Filebeat-spec.yaml

@@ -0,0 +1,3 @@
+kind: feature
+summary: Add `lumberjack` input type to the Filebeat spec.
+pr: https://github.com/elastic/elastic-agent/pull/959

changelog/fragments/1663143487-Add-support-for-hints-based-autodiscovery-in-kubernetes-provider.yaml

@@ -0,0 +1,3 @@
+kind: feature
+summary: Add support for hints' based autodiscovery in kubernetes provider.
+pr: https://github.com/elastic/elastic-agent/pull/698

changelog/fragments/1664177394-Fix-unintended-reset-of-source-URI-when-downloading-components.yaml

@@ -0,0 +1,3 @@
+kind: bug-fix
+summary: Fix unintended reset of source URI when downloading components
+pr: https://github.com/elastic/elastic-agent/pull/1252

changelog/fragments/1664212969-Create-separate-status-reporter-for-local-only-events-so-that-degraded-fleet-che.yaml

@@ -0,0 +1,4 @@
+kind: bug-fix
+summary: Create separate status reporter for local only events so that degraded fleet-checkins no longer affect health on successful fleet-checkins.
+issue: https://github.com/elastic/elastic-agent/issues/1157
+pr: https://github.com/elastic/elastic-agent/pull/1285

changelog/fragments/1664230732-Improve-logging-during-upgrades.yaml

@@ -0,0 +1,3 @@
+kind: feature
+summary: Improve logging during upgrades.
+pr: https://github.com/elastic/elastic-agent/pull/1287

changelog/fragments/1664360554-Add-success-log-message-after-previous-checkin-failures.yaml

@@ -0,0 +1,3 @@
+kind: bug-fix
+summary: Add success log message after previous checkin failures
+pr: https://github.com/elastic/elastic-agent/pull/1327