[14.0][FW-PORT] helpdesk_mgmt: Email channel

[renda-dev]

proposing again #465

@OCA/helpdesk-maintainers

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This PR has been split from #448

• Set "e-mail" channel when ticket generated from fetchmail cron task.

[PicchiSeba]

Code review: LGTM

[github-actions]

There hasn't been any activity on this pull request in the past 4 months, so it has been marked as stale and it will be closed automatically if no further activity occurs in the next 30 days.
If you want this PR to never become stale, please ask a PSC member to apply the "no stale" label.

[marcelsavegnago]

@renda-dev please do a rebase

[renda-dev]

@renda-dev please do a rebase

Done

[github-actions]

There hasn't been any activity on this pull request in the past 4 months, so it has been marked as stale and it will be closed automatically if no further activity occurs in the next 30 days.
If you want this PR to never become stale, please ask a PSC member to apply the "no stale" label.

[pedrobaeza]

Let's not lose this improvement.

/ocabot merge patch

[OCA-git-bot]

What a great day to merge this nice PR. Let's do it!
Prepared branch 14.0-ocabot-merge-pr-594-by-pedrobaeza-bump-patch, awaiting test results.

[OCA-git-bot]

This PR has the approved label and has been created more than 5 days ago. It should therefore be ready to merge by a maintainer (or a PSC member if the concerned addon has no declared maintainer). 🤖

[OCA-git-bot]

Congratulations, your PR was merged at 0d5b53d. Thanks a lot for contributing to OCA. ❤️