E2E test.

Make target optional on cli.

support targetless runs in config and layer.

Don't do sniff/steal work when agent is targetless

Make explicit targetless argument for agent.

changelog

Add compatiblity checks for config.

Run targetless first on the CI.

kube and operator changes for operator.

Make target config optional.

But make `path` required for in `TargetConfig`.
So we don't always have a `TargetConfig` (targetless if `None`),
but if we have it, it has a path.

make target optional in operator facing code.

make agent namespace required for targetless in Operator API

targetless agents unprivileged.

Error on target namespace without target.

targetless agent in target namespace with operator.

use current namespace as agent namespace when targetless and operator.

const for targetless target name.

bypass bind on targetless

Co-authored-by: Michał Smolarek <34063647+Razz4780@users.noreply.github.com>