[installer] Tidy up omitempty in config

[corneliusludmann]

Description

This change is a tidy-up of what is generated with installer init. It ...

• adds a default value to disableDefinitelyGp
• adds omitempty for values that are null by default (be more consistent, alternative: remove omitemtpy more or less everywhere and render all null values)
• updates the example-config.yaml file

How to test

Nothing to do, just look at the updated example-config.yaml file and express your feelings about this change.

Release Notes

NONE

Meta

/werft no-preview

[codecov]

Codecov Report

Merging #8436 (b1d2388) into main (63d893c) will decrease coverage by 0.82%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##            main   #8436      +/-   ##
========================================
- Coverage   8.41%   7.59%   -0.83%     
========================================
  Files         33      31       -2     
  Lines       2340    2172     -168     
========================================
- Hits         197     165      -32     
+ Misses      2138    2004     -134     
+ Partials       5       3       -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	?
install-installer-raw-app	4.58% <ø> (ø)

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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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[mrsimonemms]

Omitempty is my friend - terser config is good config