Use configLocation

[katlim-br]

Modify all places that has the node.yaml path hardcoded to refer to the configLocation value.

[rdettai]

The Values.configLocation is a very confusing parameter. After reading the code, my understanding is that it works the following way:

• if using the default value (/quickwit/node.yaml), the config that is mounted and used is the one defined inline in the Values.config
• if setting the value to another file location, the config will be read from that file (Values.config always being mounted at /quickwit/node.yaml, it is never read).

I agree this isn't clear and should at least be documented, but I believe it's the intended behavior introduced in #92. @idrissneumann @hgudladona correct me if I'm wrong.