[Bug]: Gradle check job fails to publish metrics when pr_number is null.

[prudhvigodithi]

Describe the bug

Coming from a failed gradle check job https://build.ci.opensearch.org/job/gradle-check/38585/console with error No such property: pr_number for class: groovy.lang.Binding, this error occurs because the job was triggered by parameterizedCron, this could even happen when the job was involved manually.

To reproduce

Rebuilding the job https://build.ci.opensearch.org/job/gradle-check/38585/console should throw the same error again

Expected behavior

The publishGradleCheckTestResults.groovy that publishes the metrics should get proper inputs of pr_number. For this, the gradle check job should handle when triggered by PR use the pr_number, by User or by Timer then fallback to GIT_REFERENCE. The library publishGradleCheckTestResults should also be publish the metrics with new field invoke_type where the metrics can be filtered properly by User, Timer, Post Merge Action and Pull Request.

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Host / Environment

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Additional context

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Relevant log output

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[prudhvigodithi]

Closing this as the Gradle check job does not fail now with null pr_number.