[Ingest Manager] install default packages in parallel

[neptunian]

#66125
In cloud, /setup is taking so long that it times out. We should continue to try and make more optimizations but this was an obvious one.

• Changes the installation of default packages in setup to be parallel

To test try these changes on master and compare to this branch:

• Restart elasticsearch so no packages are installed
• Refresh Kibana in the browser with devtools open and see the /setup request
• The initial setup requests takes about 9-10 seconds on master and about 6-7 with these changes

Before:

After:

Note: In the screenshots, /setup gets gets called twice in Ingest Manager, so the larger number is the one to look at which happens first

[elasticmachine]

Pinging @elastic/ingest-management (Team:Ingest Management)

[jfsiii]

I couldn't run locally because I'm having environment issues but this looks good to me.

Reducing the time from SUM(A, B, C) to MAX(A, B, C) is a big win

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 1347fe5

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

[nchaulet]

Tested locally and it work as expected :)