Add option to fetch tags even if fetch-depth > 0 (#579)

* Add option to fetch tags even if fetch-depth > 0

* Add jest tests for fetchDepth and fetchTags options

__test__/input-helper.test.ts

@@ -82,6 +82,7 @@ describe('input-helper tests', () => {
     expect(settings.sparseCheckout).toBe(undefined)
     expect(settings.sparseCheckoutConeMode).toBe(true)
     expect(settings.fetchDepth).toBe(1)
+    expect(settings.fetchTags).toBe(false)
     expect(settings.lfs).toBe(false)
     expect(settings.ref).toBe('refs/heads/some-ref')
     expect(settings.repositoryName).toBe('some-repo')