[Reporting/CSV] Increase xpack.reporting.csv.scroll.duration default

[tsullivan]

xpack.reporting.csv.scroll.duration is a setting that users sometimes need to manually update. The default is 30s, which allows 30 seconds of waiting time in between each page of search results during the capture of CSV export data. With frozen tier storage and cross-cluster search, 30 seconds is sometimes not enough for things to work normally.

Two options to change functionality to drive better user experience with exports:

1. Increase the xpack.reporting.csv.scroll.duration default to 60s. This would reduce the amount of manual configuration needed to make reporting CSV export to work.
2. Set an value for search timeout programmatically at report execution time. Make it the value as high as possible before the report job itself times out.

Option number 2 seems most favorable. It will use a timeout value based on the latest time when any more time would trigger the xpack.reporting.queue.timeout limit (which uses data in the reporting queue to detect running jobs that have become unresponsive).

[elasticmachine]

Pinging @elastic/appex-sharedux (Team:SharedUX)

[tsullivan]

Since the scroll duration is a big weak point, rather than using a config setting, maybe we should just set an internal value for it in the code, and make it as high as possible before the report job itself times out.

[tsullivan]

This issue has become a duplicate of #131852