test: add thin Ginkgo coverage (#5820)

* test: add thin ginkgo coverage

Signed-off-by: Harsh <harshmastic@gmail.com>

* test: tighten thin worker readiness assertion

Signed-off-by: Harsh <harshmastic@gmail.com>

* test: align thin ginkgo helpers with review

Signed-off-by: Harsh <harshmastic@gmail.com>

* test: restore thin runtime2 build scenario

Signed-off-by: Harsh <harshmastic@gmail.com>

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Signed-off-by: Harsh <harshmastic@gmail.com>

Author: hxrshxz