Make sure fixtures are used in tests and not overwritten

[metas-dh]

Test shall include:

• Customer Fixtures to use: (if needed)
• What to test
• Expectation for the test to be successful

Atm we use fixtures in most of our tests; however, they are set at the beginning of the test but get overwritten later on with randomized values (usually sth like e.g. "TestName" plus Timestamp). To adapt the tests to customer data, we need to make sure that the fixtures are not overwritten at some point in the test, so that we can use customer-specific fixtures (plus Timestamp, so that the tests can run >1 time).

For that,

1. the fixtures we have atm need to be renamed: the fixture shall have the same name as the test (e.g. taxrate.json becomes taxrate_setup_spec.json)
2. the objects used in the tests need to be adapted
3. the tests need to be adapted

⚠️ The test that i modified for the drafts is: cypress/integration/price/add_a_product_to_a_pricelist_schema_and_create_a_new_PLV.js (check it to see how many things have to be changed in either variant)

Todo for developer (besides coding)

• Always make sure the issue is in the correct project lane
• [x] run your test in jenkins e2e on a vanilla db
  • https://dev654.metasfresh.com
• [x] jenkins console URL / cypress dashboard URL to the successful test suite run (not just yours)
  • https://jenkins.metasfresh.com/job/ops/job/run_e2e_tests/600/console
• [x] get it integrated into master
  • Please note that the 2 drafts are mutually exclusive and should not be merged both into master!
  • [ ] Draft 1: Use a FAT FIXTURE containing all the data needed in a test in a single fixture: https://github.com/metasfresh/metasfresh-e2e/pull/293 (very difficult to use)
  • [x] Draft 2: Use a minimal fixture for customer-specific data only: https://github.com/metasfresh/metasfresh-e2e/pull/295 (easy to use and with minimal changes)

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[TheBestPessimist]

I think we can close this issue now, since both me and @cristinastefan90 have moved (pretty much?) all the tests to use data from fixtures instead of harcoded data.