fix: socket and saved reply (backport #3000)

[mergify]

1. Socket in customer portal side.
2. Append Saved Reply to email content instead of replacing it
3. Redis search syntax error
4. Dont send notification if user from and user to are same

closes: #2684
closes: #3005

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This is an automatic backport of pull request #3000 done by Mergify.

[mergify]

Cherry-pick of 69e047f has failed:

On branch mergify/bp/main-hotfix/pr-3000
Your branch is up to date with 'origin/main-hotfix'.

You are currently cherry-picking commit 69e047f6.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   desk/src/components/EmailEditor.vue
	modified:   desk/src/pages/SearchAgent.vue

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   desk/src/pages/ticket/TicketCustomer.vue

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally