Truncate Capybara screenshot from 255 to 150 characters

Stan Hurequested to merge
sh-truncate-capybara-filename-more into master

What does this MR do and why?

We are seeing ENAMETOOLONG errors in https://gitlab.com/gitlab-org/gitlab/-/jobs/4279463261. It seems that we need to leave room for the full pathname to the file.

Related to #410055 (closed)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Bala Kumar

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