[FW][FIX] account: Add subject attribute to load_key_and_certificate

[fw-bot]

Problem

In l10n_ec_edi_certificate.py, we attempt to get the subject attribute which does not exist in the namespace.

Solution

Add the attribute to the namespace returned.

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Forward-Port-Of: odoo/odoo#165580

[robodoo]

.

[fw-bot]

@aboo-odoo @jco-odoo this PR targets saas-16.4 and is the last of the forward-port chain.

To merge the full chain, use

@fw-bot r+

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

[aboo-odoo]

@fw-bot r+

[jco-odoo]

@fw-bot r+

[robodoo]

@aboo-odoo @jco-odoo staging failed: ci/upgrade_enterprise (view more at https://runbot.odoo.com/runbot/build/62551382)

[aboo-odoo]

@robodoo retry

[robodoo]

@aboo-odoo @jco-odoo staging failed: ci/upgrade_enterprise (view more at https://runbot.odoo.com/runbot/build/62551779)

[fw-bot]

@aboo-odoo @jco-odoo this PR was modified / updated and has become a normal PR. It should be merged the normal way (via @robodoo)

[aboo-odoo]

@robodoo r+