feat: generate a k8s_name for test

[ImSingee]

Some extensions' name contain _, such as pg_ivm, pg_textsearch. Tests will fail on these extensions because this name violates k8s name's rule.

This PR fixes this by generating a k8s_name field in values.yaml and use this name as all k8s resource names.

[ImSingee]

Another thing I found when working on this PR: There's a e2e:test:all task available, but it executes e2e:test. However, the e2e:test task requires values.yaml file available for each target (which can be generated by e2e:generate-values). But currently there's no way to generate values file for all targets.

I think update e2e:test:all task's behaviour to execute e2e:test:all is better.