[16.0][FIX] hr_expense_analytic_tag: Fix + improve tests

[victoralmau]

Fix + improve tests

Related to odoo/odoo@063e224

Please @pedrobaeza can you review it?

@Tecnativa

[pedrobaeza]

Fast-tracking to fix the branch

/ocabot merge patch

[OCA-git-bot]

This PR looks fantastic, let's merge it!
Prepared branch 16.0-ocabot-merge-pr-716-by-pedrobaeza-bump-patch, awaiting test results.

[OCA-git-bot]

@pedrobaeza The merge process could not be finalized, because command git push origin 16.0-ocabot-merge-pr-716-by-pedrobaeza-bump-patch:16.0 failed with output:

To https://github.com/OCA/account-analytic
 ! [rejected]          16.0-ocabot-merge-pr-716-by-pedrobaeza-bump-patch -> 16.0 (fetch first)
error: failed to push some refs to 'https://github.com/OCA/account-analytic'
hint: Updates were rejected because the remote contains work that you do not
hint: have locally. This is usually caused by another repository pushing to
hint: the same ref. If you want to integrate the remote changes, use
hint: 'git pull' before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

[OCA-git-bot]

Congratulations, your PR was merged at e85c801. Thanks a lot for contributing to OCA. ❤️