Fast SAST mode scanning changed files only

[attiasas]

• All tests passed. If this feature is not already covered by the tests, I added new tests.
• This pull request is on the dev branch.
• I used gofmt for formatting the code before submitting the pull request.
• Update documentation about new features / new supported technologies

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Depends on:

• Fast sast mode using changed files jfrog-cli-security#739
• Add Changed files to GitInfoContext jfrog-client-go#1337