Set child pipelines interruptible: true by default

andreyrequested to merge
acunskis-interruptible-issue into master

What does this MR do and why?

As per explanation here: !98185 (comment 1120236520) this should allow to safely enable child pipeline cancel without encountering problems in master runs.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by andrey

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