fix: panic may occur when calculating the final task timeout waiting time

[cugykw]

When I was troubleshooting this issue: #7185, I also found another problem. Determining the final task timeout waiting time may cause panic

If you set the pipelinerun finally timeout and also set the pipeline timeout to 0s, this will cause the program to panic.

Changes

This commit no functional changes, it will avoid the panic caused by the above scenario.

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Release Notes

NONE

/kind bug

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[cugykw]

/kind bug

[pritidesai]

/ok-to-test

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/test check-pr-has-kind-label

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[cugykw]

/assign @jerop @pritidesai

[jerop]

/lgtm

thanks @cugykw