fix: include ws in nameless refs with a ns

[jahvon]

Small fix where references for a bug where an executable with a namespace and an unset name resulted a ref like exec ns: instead of exec ws/ns:

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
types/executable/executable.go	0.00%	1 Missing ⚠️

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