Support direct exporter leasing by name in addition to the existing l…

[bkhizgiy]

Add support for leasing an exporter by name in addition to label-based selection.
The controller now handles the new exporter_selection, validates that exactly one option is provided and its not empty, and routes leases through either the direct name-based path or the existing selector-based flow.
Existing behavior is unchanged.

Issue: https://github.com/jumpstarter-dev/jumpstarter/issues/638
Releted to: jumpstarter-dev/jumpstarter-protocol#34

TODO:

• Add tests coverage
• Implement CLI changes once the protocol + controller side flows are approved.

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