Prevent absorbing keyword timeout

[JFoederer]

Keyword timeouts in Robot are triggered by raising a TimeoutExceeded exception. In Robot's exception classes tree this exception is derived from the regular Exception type, unlike similar exception types that interrupt user code, like KeyboardInterrupt that are derived from BaseException. As a result, some broader exception traps could absorb a timeout exception, failing the keyword to be interrupted and getting stuck. This PR removes too generic catch-all clauses where possible and reraises TimeoutExceeded in situations where unknown exceptions can arise from code outside RobotMBT's control.

[JFoederer]

I did not add a test case for this fix, due to the issue where Robot does not allow you to catch timeouts. the following code snippet does not work, it still fails on the timeout:

*** Test Cases ***
Keyword timeout propagates back to Robot
    Run keyword and expect error    Keyword timeout*    Time-bound keyword

*** Keywords ***
Time-bound keyword
    [Timeout]    200 milliseconds
    Sleep    2 sec

See also this thread on Slack

[JFoederer]

Issue #5610 and pull request #5611 are available for Robot Framework to fix this from RF Core.