[jetbrains] improve startup performance

[akosyakov]

Description

Improve startup performance of JB backends by auto downloading shared indexes and preserving indexes between restarts.

It also reconfigured idea properties and vmoption. We should put them into /ide-desktop/backend/bin/idea.properties and idea64.vmoptions correspondingly. Otherwise JB will complain on each startup.

Related Issue(s)

Fixes #

How to test

• Start a new workspace: https://ak-jb-index-enh.staging.gitpod-dev.com/#referrer:jetbrains-gateway/https://github.com/gitpod-io/spring-petclinic
• You should not see any notifications about unnecessary JVM options or enabling shared indexes. You should see thought that shared indexes are auto downloading and maven modules are already importing, mvn deps are resolving, mvn plugins are downloading, etc. In production you will need to wait till JDK is indexed or enable shared indexes manually.
• When maven background tasks are finished restart a workspace. This time tooling should be available almost immediately.

Release Notes

NONE

Documentation

[codecov]

Codecov Report

Merging #8158 (2667324) into main (07e013e) will decrease coverage by 1.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #8158      +/-   ##
==========================================
- Coverage   12.31%   11.17%   -1.14%     
==========================================
  Files          20       18       -2     
  Lines        1161      993     -168     
==========================================
- Hits          143      111      -32     
+ Misses       1014      880     -134     
+ Partials        4        2       -2     

Flag	Coverage Δ
components-gitpod-cli-app	11.17% <ø> (ø)
components-local-app-app-darwin-amd64	?
components-local-app-app-darwin-arm64	?
components-local-app-app-linux-amd64	?
components-local-app-app-linux-arm64	?
components-local-app-app-windows-386	?
components-local-app-app-windows-amd64	?
components-local-app-app-windows-arm64	?

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Impacted Files	Coverage Δ
components/local-app/pkg/auth/auth.go
components/local-app/pkg/auth/pkce.go

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[felladrin]

Code reviewed and tested ✅
After restarted, the workspace is ready for use notable faster!