[FW][FIX] account_edi: Simplify payment EDI flow

[fw-bot]

Since recent changes on account_edi, the Mexican payment flow is quite broken.
Since the payment flow has been made only for the Mexican localization,
this commit is simplifying a lot the flow to only fit the need of this localization
and resolves the introduced bugs.

---

I confirm I have signed the CLA and read the PR guidelines at www.odoo.com/submit-pr

Forward-Port-Of: #155509

[robodoo]

Pull request status dashboard.

[fw-bot]

@smetl @jco-odoo cherrypicking of pull request #155509 failed.

stdout:

Auto-merging addons/account_edi/models/account_edi_document.py
Auto-merging addons/account_edi/models/account_move.py
CONFLICT (content): Merge conflict in addons/account_edi/models/account_move.py

stderr:

15:03:42.169429 git.c:463               trace: built-in: git cherry-pick 8988f69b77b6022800d470c59a89da5b28e677ee
error: could not apply 8988f69b77b6... [FIX] account_edi: Simplify payment EDI flow
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".
----------
status:

Either perform the forward-port manually (and push to this branch, proceeding as usual) or close this PR (maybe?).

In the former case, you may want to edit this PR message as well.

⚠️ after resolving this conflict, you will need to merge it via @robodoo.

More info at https://github.com/odoo/odoo/wiki/Mergebot#forward-port

[jco-odoo]

@robodoo r+

[robodoo]

@jco-odoo you may want to rebuild or fix this PR as it has failed CI.