Enable Dockerfile build capabilities by default

The Linux capabilities SETUID and SETGID, required to build a container image using podman in rootless mode, are now enabled by default. Administrators can still opt-out setting CheCluster CR .spec.devEnvironments.disableBuildCapabilities to true. This is the last step of the journey to allow building Dockerfile from within an Eclipse Che cloud development environment. It started with a manual procedure described in[ this blog post|https://che.eclipseprojects.io/2022/10/10/@mloriedo-building-container-images.html], was exposed through one single property in[ Eclipse Che v7.56|https://github.com/eclipse/che/releases/tag/7.56.0] and is now, after a months of feedbacks in real world Kubernetes clusters, enabled by default.

Synced from eclipse/che issue

https://github.com/eclipse/che/issues/22032

Is your enhancement related to a problem? Please describe

Current default configuration for Che is:

spec.devEnvironments.disableBuildCapabilities: true

and podman build doesn't work by default.

Describe the solution you'd like

For new installations the default should be:

spec.devEnvironments.disableBuildCapabilities: false

For update of existing installations we should not change the value of disableBuildCapabilities.