[FEATURE] Use paratest for composer script

[Starkmann]

This needs to be done for runTests.sh as well

Part of #1379

[coveralls]

Pull Request Test Coverage Report for Build 10903154462

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

---

Totals
Change from base Build 10902196680:	0.0%
Covered Lines:	67
Relevant Lines:	67

---

💛 - Coveralls

[Starkmann]

With parallel execution we have a race condition between functional test since they all are running on the same database:

Duplicate entry '1' for key 'tx_tea_domain_model_tea.PRIMARY'

[coveralls]

Pull Request Test Coverage Report for Build 12871959564

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

---

Totals
Change from base Build 12871949506:	0.0%
Covered Lines:	101
Relevant Lines:	101

---

💛 - Coveralls