[SDCICD-1765] print cleanup errors in slack notification summary

[varunraokadaparthi]

Slack notifications were only sent when cleanup reached the end of run. Any failure before that (e.g. config load, collect active clusters, VPC/IAM/S3 cleanup) caused an early return, so no summary was sent.

Fix: Send the summary from a defer so it runs on every exit. The summary includes whatever was collected so far and, on failure, appends the error. All failure paths now explicitly return runErr.

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[ritmun]

/lgtm

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New changes are detected. LGTM label has been removed.

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