(PXP-7402) Discovery page

[mpingram]

Jira Ticket: PXP-7402

Adds a beta version of the Discovery page, which shows a list of the studies available on the Gen3 commons. Also adds support for Typescript (compiling w/ babel, tests, and linting). This PR looks a lot bigger than it really is due to test data + Typescript setup -- the files to start with are:

• src/Discovery/index.tsx <- this connects the Discovery page to the metadata-service backend and handles access checking
• src/Discovery/Discovery.tsx <- this is the entire Discovery page -- I kept it in one file on purpose, as the Discovery page is still a beta feature and we're going to heavily modify its appearance in the future (adding a grid view, etc).
• src/Discovery/Discovery.test.tsx

Running at https://mpingram.planx-pla.net/discovery. Working on deploying to my dev env but running into problems with submitting data to MDS. For the moment, please test with these instructions:

1. Check out this branch of cdis-manifest: https://github.com/uc-cdis/cdis-manifest/tree/feat/bdc-staging-discovery-page.
2. Run portal locally against https://staging.gen3.biodatacatalyst.nhlbi.nih.gov/:
   HOSTNAME=staging.gen3.biodatacatalyst.nhlbi.nih.gov NODE_ENV=auto bash ./runWebpack.sh

Configuration

To deploy Discovery page:

• "featureFlags": { "discovery": true } must be set in the portal config.
• If discoveryConfig.features.authorization.enabled: true, "useArboristUI": true must be set in the portal config.
• "discoveryConfig": must be set in the portal config. DiscoveryConfig documentation can be found at https://github.com/uc-cdis/data-portal/blob/master/docs/portal_config.md
• To upload data to Discovery page, data must be uploaded to environment's metadata-service instance with guid_type: "discovery_metadata". The metadata must all be under the top-level property gen3_discovery. (No documentation on this process yet, see this gist for right now https://gist.github.com/Avantol13/a53593837503fede2881f315198247c4)

New Features

• Adds a beta version of the Discovery page, which shows a list of the studies available on the Gen3 commons.

Breaking Changes

Bug Fixes

Improvements

• Adds support for Typescript to the portal codebase.

Dependency updates

Deployment changes

• To deploy Discovery page:
  • "featureFlags": { "discovery": true } must be set in the portal config.
  • If discoveryConfig.features.authorization.enabled: true, "useArboristUI": true must be set in the portal config.
  • "discoveryConfig": <DiscoveryConfig> must be set in the portal config. DiscoveryConfig documentation can be found at https://github.com/uc-cdis/data-portal/blob/master/docs/portal_config.md
  • To upload data to Discovery page, data must be uploaded to environment's metadata-service instance with guid_type: "discovery_metadata". The metadata must all be under the top-level property gen3_discovery. (No documentation on this process yet, see this gist for right now https://gist.github.com/Avantol13/a53593837503fede2881f315198247c4)