Introducing new trigger Frogbot tests against dev-master

[eranturgeman]

• [x] All tests passed. If this feature is not already covered by the tests, I added new tests.
• [x] This pull request is on the dev branch.
• [x] I used gofmt for formatting the code before submitting the pull request.

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This PR introduces a new trigger for Frogbot's tests. The new 'workflow_dispatch' trigger enables to trigger Frogbot's tests on-demand against dev-master env, which enables us to check compatibility to the latest Xray changes before release

[github-actions[bot]]

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🐸 JFrog Frogbot