allow customizing timeout values

[ScottLinnn]

Add a flag to config timeout value for this benchmark because the time needed for index covering 100% varies a lot by provider. Hardcoded value fitting one provider will be too large/too small for other provider(s)

[Copilot]

Pull Request Overview

This PR adds a configurable timeout value for the EDW create index benchmark to accommodate varying index building times across different database providers. The change replaces a hardcoded timeout value with a configurable flag.

• Adds a new command-line flag edw_create_index_benchmark_timeout with a default value of 600 seconds
• Updates the _MeasureBuildingTime function's default timeout parameter from 120 to 600 seconds
• Modifies the Run function to pass the configurable timeout value to _MeasureBuildingTime

[Copilot]

[nitpick] The description should end with a period for consistency with other flag descriptions.

Suggested change

	'Timeout for the edw_create_index_benchmark in seconds. Default is 600'
	' seconds',
	'Timeout for the edw_create_index_benchmark in seconds. Default is 600.'
	' seconds.',

[jnguertin]

Having a flag for the timeout is good, although I recommend setting a default value high enough that all providers that complete in a reasonable time come in under the timeout -- if a provider finishes way before the timeout, that's no problem.

[jnguertin]

LGTM.