refactor: consolidate all settings in defaultProcessSettings

[shivaraj-bh]

resolves #317

[shivaraj-bh]

This PR will have to be reverted because it falsely assumes that even processes other than the one named name (name from services.<service>.<name>) also takes the same defaults, which is not true.

For example, when <name>-init process of postgres fails, the default setting, availability.restart, will restart the process, even though that is not the desired behaviour.

This wasn’t caught in CI because we don’t test failure of init process of any service, guess I will add them in the PR that reverts this change.