[QE] limit log size for test reports

[albfan]

Fixes: Issue #4373

Solution/Idea

Reports with long messages are hanging reportportal. Limit its size

Proposed changes

after post process xml report, limit log size

Testing

Tested on log reports long and short than max size

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adrianriobo

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[openshift-ci]

@albfan: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/integration-crc	354ae45	link	true	/test integration-crc
ci/prow/e2e-crc	354ae45	link	true	/test e2e-crc

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