ci: dispatch run-rosetta-tests event to rosetta-kava

[evgeniy-scherbina]

PR adds new Dispatch run-rosetta-tests event to rosetta-kava CI workflow, which triggers re-running tests in rosetta-kava repo.

Related to:

• https://github.com/Kava-Labs/rosetta-kava/pull/69
• https://github.com/Kava-Labs/rosetta-kava/pull/70