Onboarding charts

[lachmanfrantisek]

• Add info about onboarded projects to the backend API.
• Add new cumulative usage charts to show the state of onboarding.
• Show the newly onboarded projects. Both globally or once the project starts to use a new job.

Fixes: packit/packit-service#2232

Some screenshots using prod data:

Past month

Past year

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RELEASE NOTES BEGIN
There are new usage charts at https://dashboard.packit.dev/usage showing the status of new projects' onboarding.
RELEASE NOTES END

[usercont-release-bot]

Preview: https://packit-dashboard-pr-359.surge.sh (deployed at Mon 27 Nov 2023, 14:54 UTC)

[lachmanfrantisek]

It still uses the backend API since I still haven't had much time to move it..;(

So, it's slow but produces quite interesting data.

[softwarefactory-project-zuul]

Build succeeded.
https://softwarefactory-project.io/zuul/t/packit-service/buildset/df7a3a9f39c149f285ffdee0268d5093

✔️ pre-commit SUCCESS in 1m 55s

[lachmanfrantisek]

Plans for the follow-up PR:

• Get rid of / replace "All projects" charts since it's time-interval-independent.
• Provide a progress indicator (e.g. http://v4-archive.patternfly.org/v4/components/progress ) for our quarterly goal. (Not sure where to put it.)

[lbarcziova]

thanks!