Remove entity stable ID from generic assay name

[MatthijsPon]

Follow up to cBioPortal/cbioportal-core#7

As the ENTITY_STABLE_IDs for Generic Assays are now more strictly validated, we propose to simply hide the stable ID if the NAME property is given, instead of showing NAME (ENTITY_STABLE_ID).

Describe changes proposed in this pull request:

• a
• b

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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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[inodb]

Could use a "use case" description to better understand why this is necessary