Change CBIOPORTAL_URL to staging environment (TESTING PARRELEL)

[alisman]

Fix cBioPortal/cbioportal# (see https://help.github.com/en/articles/closing-issues-using-keywords)

Describe changes proposed in this pull request:

• a
• b

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• Has tests or has a separate issue that describes the types of test that should be created. If no test is included it should explicitly be mentioned in the PR why there is no test.
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• Is this PR adding logic based on one or more clinical attributes? If yes, please make sure validation for this attribute is also present in the data validation / data loading layers (in backend repo) and documented in File-Formats Clinical data section!

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[Copilot]

Pull request overview

Updates the master branch environment configuration to point CBIOPORTAL_URL at a staging backend, affecting how branch-aware scripts (and CI e2e) resolve the target cBioPortal instance.

Changes:

• Changed CBIOPORTAL_URL in env/master.sh from https://www.cbioportal.org to https://staging.cbioportal.org.

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