Add 97 tests:
- account_ebics: order numbers, camt and CFONB split per account,
journal lookup, duplicate statements, download and upload wizards,
key initialisation (INI/HIA/HPB), passphrase change, admin orders.
- account_ebics_batch: scheduled import, import log, reprocess.
- account_ebics_payment_order / account_ebics_batch_payment: upload of
the payment file and link to the payment document.
- account_ebics_statement_import_test (new, test-only, not to install
in production): installs the OCA camt and CFONB parsers in CI and
runs the end-to-end statement import.
The bank is simulated by patching ebics.xfer._setup_client, or the
fintech client classes for the key initialisation; keys, certificates
and the INI letter are real, created in a temporary directory.
