finish_pw_contextの動画保存処理を修正

[NishikawaKoharu]

Purpose

Fix unstable video saving and cleanup in finish_pw_context, and make Playwright session shutdown and recording export more reliable.

Changes

• Save videos with page.video.save_as() after closing pages, instead of copying from video.path()
• Prevent duplicate cleanup by fixing the shutdown flow
• Close pages before closing the browser context
• Increase the finish_pw_context timeout from 30 seconds to 60 seconds
• Delete the temporary directory only when it exists

Ticket

https://redmine.devops.rcos.nii.ac.jp/issues/62226

Custom Test Configuration

• RDM_REPOSITORY:
• RDM_BRANCH:
• RDM_MERGE:

• OSF_IMAGE:
• EMBER_IMAGE:
• CAS_IMAGE:
• MFR_IMAGE:
• WB_IMAGE:
• EXCLUDE_NOTEBOOKS:

[yacchin1205]

ありがとうございます。マージします。(Flowable Rolesのテスト失敗については、mainに合流後調査します。)