Remove deprecated Jwt-related functionality, replace by a different library

[Aiosa]

Fix #11062

org.springframework.security.jwt is not usable since it does not handle valid tokens with typ="at+jwt". Replaced with nimbus-jose-jwt. No new tests are needed since this just replaces one library with another: current test suite should be sufficient.

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

[Aiosa]

Note that this PR does not replace the other usage of JWTHelper in OAuth2DataAccessTokenServiceImpl, but I don't doubt I will have to soon add this too..