fix: use finalizer lock in EC build-definitions

[zregvart]

Description

The EC test in build-definitions was failing because the PipelineRun was garbage collected mid-test, so the logs that are asserted were not available.
This uses a finalizer lock on the PipelineRun to make sure it is still present while the logs are asserted in the test scenario.

Issue ticket number and link

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Ran with this version in build-definitions on konflux-ci/build-definitions#1460

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added meaningful description with JIRA/GitHub issue key(if applicable), for example HASSuiteDescribe("STONE-123456789 devfile source")
• I have updated labels (if needed)

[psturc]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lcarva, psturc, simonbaird

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