Fixes bills matching

[drazik]

We had some cases in which our bills matching algorithm fails. This had the following causes:

• In io.cozy.bills, the vendor property sometimes matches our brand dictionary's name property, and sometimes the konnectorSlug property. So we now try to get the brand from name and konnectorSlug instead of just name
• The category filter was only using the automaticCategoryId and manualCategoryId. But we now have cozyCategoryId and localCategoryId. So we just use the getCategoryId helper that implements all that instead of the previously incomplete getCategoryId

I also refactored Linker::linkBillsToOperations tests so that it's easier to read and maintain. Each test case now lives inside its own file and is in a JS object format instead of text format that needs to be parsed and become less and less readable as we add new cases.

[todo]

Find out why our models parent class and Document from cozy-doctypes are different

cozy-banks/scripts/visualizer/src/server/index.js

Lines 12 to 17 in d8fb0c3

	// TODO Find out why our models parent class and Document from cozy-doctypes are different
	Document.registerClient(cozyClient)
	Bill.registerClient(cozyClient)
	class DryLinker extends Linker {
	commitChanges() {

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This comment was generated by todo based on a TODO comment in d8fb0c3 in #1440. cc @cozy.