fix(tests): check before create new product type

[lojzatran]

There was an issue that more than 1000 product types were created. This is the limit of CTP: https://docs.commercetools.com/api/limits#product-types. So, we need to ensure that the product type is created only if it does not exist. This PR checks if the product type exists before creating a new one.

[changeset-bot[bot]]

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Latest commit: ab80939a060c13fa056136077cd5fea1e94215c4

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.07%. Comparing base (a4fcf87) to head (ab80939). Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #796 +/- ## ========================================== + Coverage 92.90% 93.07% +0.17% ========================================== Files 25 25 Lines 282 289 +7 Branches 12 14 +2 ========================================== + Hits 262 269 +7 Misses 20 20 ``` | [Flag](https://app.codecov.io/gh/commercetools/commercetools-sdk-typescript/pull/796/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=commercetools) | Coverage Δ | | |---|---|---| | [integrationtests](https://app.codecov.io/gh/commercetools/commercetools-sdk-typescript/pull/796/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=commercetools) | `93.07% <100.00%> (+0.17%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=commercetools#carryforward-flags-in-the-pull-request-comment) to find out more.

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[ajimae]

Hi @lojzatran, can we get a description of what this PR or maybe what it is trying to achieve? Thanks

[lojzatran]

Hi @lojzatran, can we get a description of what this PR or maybe what it is trying to achieve? Thanks

Hi @ajimae, I added the description.