Updated release-notes files

Author: prakarsh-dt

beta-releasenotes.md renamed to CHANGELOG/release-notes-v1.4.0.md

@@ -1,3 +1,5 @@
+## v1.4.0
+
 ## Enhancements
 - feat: Made ng labels env driven (#6438)
 - feat: Link helm release (#6454)
@@ -14,3 +16,5 @@
 - fix: incorrect gitops metrics (#6444)
 - fix: envId check in EventBuilder.go (#6436)
 - fix: createDockerRepoIfNeeded error handling (#6433)
+
+

releasenotes.md

@@ -0,0 +1,20 @@
+## v1.4.0
+
+## Enhancements
+- feat: Made ng labels env driven (#6438)
+- feat: Link helm release (#6454)
+- feat: access manager (#6377)
+- feat: migrate external argo cd application (#6303)
+- feat: Dark Mode v1 (#2348)
+- feat: Dark Mode v2 (#2367)
+- feat: Dark Mode v3 (#2484)
+## Bugs
+- fix: cluster update issue (#6465)
+- fix: in CreateGrafanaDataSource (#6463)
+- fix: onboard acd app (#6457)
+- fix: prom client in chart-sync (#6442)
+- fix: incorrect gitops metrics (#6444)
+- fix: envId check in EventBuilder.go (#6436)
+- fix: createDockerRepoIfNeeded error handling (#6433)
+
+