Remove integrity_sync data in stable phase

[Selutario]

Related issue
Closes #2814

Description

This PR fixes the problem reported at #2814.

The problem occurs because the setup and stable phases are calculated using only the data of the master node (since that is the only node whose performance is seriously affected during setup). However, sometimes workers can display a last Integrity_sync log dated after the end of the setup phase on the master, causing the failure.

Integrity sync data in a worker after the setup phase is now discarded, so the error no longer occurs.

Logs example

$ python3 -m pytest performance/test_cluster/test_cluster_performance/test_cluster_performance.py --artifacts_path=/home/selu/Descargas/cluster_performance/fix_performance/artifacts --n_agents=50000 --n_workers=10 -vv

========================================================================= test session starts ==========================================================================
platform linux -- Python 3.8.10, pytest-5.0.0, py-1.8.2, pluggy-0.13.1 -- /usr/bin/python3
cachedir: .pytest_cache
metadata: {'Python': '3.8.10', 'Platform': 'Linux-5.4.0-117-generic-x86_64-with-glibc2.29', 'Packages': {'pytest': '5.0.0', 'py': '1.8.2', 'pluggy': '0.13.1'}, 'Plugins': {'metadata': '1.10.0', 'html': '3.1.1', 'testinfra': '5.0.0', 'tavern': '1.2.2', 'pep8': '1.0.6', 'cov': '2.10.0', 'asyncio': '0.14.0'}}
rootdir: /home/selu/Git/wazuh-qa/tests
plugins: metadata-1.10.0, html-3.1.1, testinfra-5.0.0, tavern-1.2.2, pep8-1.0.6, cov-2.10.0, asyncio-0.14.0
collected 1 item                                                                                                                                                       

performance/test_cluster/test_cluster_performance/test_cluster_performance.py::test_cluster_performance PASSED                                                   [100%]

======================================================================= 1 passed in 0.50 seconds =======================================================================

Tests

• Proven that tests pass when they have to pass.
• Proven that tests fail when they have to fail.

• Python codebase satisfies PEP-8 style style guide. pycodestyle --max-line-length=120 --show-source --show-pep8 file.py.
• Python codebase is documented following the Google Style for Python docstrings.
• The test is documented in wazuh-qa/docs.
• provision_documentation.sh generate the docs without errors.