Index project script should also reindex timelines and milestones

[maxceem]

We have endpoint for re-indexing project by admin: /projects/admin/es/project/index, see https://github.com/topcoder-platform/tc-project-service/blob/develop/src/routes/admin/project-index-create.js

• When we call it reindex all the data we have in the project index.
• Though we also have some data in timelines index, like timelines and milestones of the project.
• So when we reindex project, we also have to find all the timelines and milestones of the project and reindex them too.

The same should also work for data export script:

• npm run data:import and npm run local:init

For the demo, we have to update npm run data:export script so it also exports timelines and milestones of the projects and updates demo data accordingly.

[RishiRajSahu]

fyi @vikasrohit