Fix InactiveProjectsDeletionCronWorker not timing out after maximum allowed run time

What does this MR do and why?

• In this MR !88751 (merged) we added a maximum allowed run time for theInactiveProjectsDeletionCronWorker,however, we missed timing out in case the feature flag was disabled.
• This MR fixes this behavior and moves the over_time? check above the feature flag check to ensure that the the worker is timed out after exceeding the maximum allowed run time.
• Make the existing RSpecs related to the timeout as shared_examples and added these examples to both the scenarios when the feature flag is enabled and when it's disabled to ensure that the worker is timed out even if the feature flag is disabled.

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Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/363319