fix: ec pipeline conforma violation in build-template.go

[cuipinghuo]

Description

exclude slsa_source_correlated.source_code_reference_provided to fix conforma violation

Issue ticket number and link

https://issues.redhat.com/browse/KONFLUX-5787

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?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

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)

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[simonbaird]

/approve

[openshift-ci]

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[simonbaird]

/lgtm

[openshift-ci]

New changes are detected. LGTM label has been removed.