fix: Extract correct values for user email and use configuration property for user displayed name

[pnartowski]

Extract user email from authentication token, use configuration property to define displayed user name.

Fix # When using oauth2 or optional_oauth2 random UUID is displayed instead of user email or full name.

Describe changes proposed in this pull request:

• for oauth2 authentication extract email from Principal class
• use configuration property skin.user_display_name to define what value should be show for user name, this property was already defined but never used

Checks

• The commit log is comprehensible. It follows 7 rules of great commit messages. We can fix this during merge by using a squash+merge if necessary
• 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.
• 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!
• Make sure your PR has one of the labels defined in https://github.com/cBioPortal/cbioportal/blob/master/.github/release-drafter.yml

Any screenshots or GIFs?

If this is a new visual feature please add a before/after screenshot or gif
here with e.g. Giphy CAPTURE or Peek

Notify reviewers

Read our Pull request merging
policy. It can help to figure out who worked on the
file before you. Please use git blame <filename> to determine that
and notify them either through slack or by assigning them as a reviewer on the PR

to

[pnartowski]

@dippindots @inodb @arishta may I ask you to review my PR ?