Make project and robot as required in PSB

[hanlins]

The current reconciliation logic is confusing and might cause confusion. Among the 4 possible combinations of robot and project annotation existence, which are:

1. robot not exist, project not exist
2. robot not exist, project exist
3. robot exist, project not exist
4. robot exist, project exist

Case 2, 3 are invalid. For case 1, we need to automatically create harbor project and robot account, and for case 4, we need check whether these information are valid in harbor. It's overly complicated for PSB as it should be solely focusing on secret binding.

Proposing to move the annotation validation logic to namespace controller and making robot and project required field for PSB object. Namespace controller should validate or create corresponding resources, and create PSB with validated configurations. For PSB, it should always assume that the project and robot in its spec exists in harbor.