🔨Refactor code: retrieve ndex tooltip information dynamically

[SAHU-01]

Fix cBioPortal/cbioportal#10595 (see https://help.github.com/en/articles/closing-issues-using-keywords)

Describe changes proposed in this pull request:

• Using this endpoint to populate the Ndex Cancer Pathways tooltip rather than hardcoding it as it is now
• Not finding the exact match for hardcoded URLs in endpoint, currently all URLs point to "#" (can be adjusted after discussion)

Checks

• 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.
• The commit log is comprehensible. It follows 7 rules of great commit messages. For most PRs a single commit should suffice, in some cases multiple topical commits can be useful. During review it is ok to see tiny commits (e.g. Fix reviewer comments), but right before the code gets merged to master or rc branch, any such commits should be squashed since they are useless to the other developers. Definitely avoid merge commits, use rebase instead.
• 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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[alisman]

Thanks for making this PR! Would be good to use our remoteData/mobxpromise solution for handling data fetching state

[SAHU-01]

@alisman I've made the changes requested, for handling data fetching state.
Apart from that, regarding the difference in URLs present in the hardcoded - static code and the endpoint, I've added the endpoint URLs. [I still haven't removed the commented static code]
Please review the changes and let me know if any further adjustments are needed.
-- Thanks!

[alisman]

@SAHU-01 we really appreciate you doing this work for us. I will be out of the office next week. If you have any questions about my change requests, please ask @onursumer. Sorry I didn't catch the second round of requests earlier. FYI @inodb

[SAHU-01]

@alisman I've made the changes requested.
Please review the changes and let me know if any further adjustments are needed!

[onursumer]

Looks good! Just a few more minor requests.