Python codegen improvement: timeouted tests and exceptions

[tamarinvs19]

Description

• (Fixes Python: generate tests for timeouted functions #1939) Added tests skipping for timeouted tests. New problem: now we can't minimise these tests because we don't have coverage information. Current fix: maximal number of timeouted tests have been fixed. New issue about it Update python coverage collection #2100.
• (Fixes Use setting Tests with exception for Python #2098) Assertions for executions are rendering according to global setting Tests with exception

How to test

Manual tests

Timeouted tests

1. Generate tests for the long function, e.g.

import time
def f(x):
    time.sleep(2000)

2. Expected: test with skipping decorator
   • for unittest: @unittest.skip(reason='Disabled due to the fact that the execution is longer then 1000 ms')
   • for pytest: @pytest.skip(reason='Disabled due to the fact that the execution is longer then 1000 ms')

Exception asserts

See #2098

Self-check list

Check off the item if the statement is true. Hint: [x] is a marked item.

Please do not delete the list or its items.

• I've set the proper labels for my PR (at least, for category and component).
• PR title and description are clear and intelligible.
• I've added enough comments to my code, particularly in hard-to-understand areas.
• The functionality I've repaired, changed or added is covered with automated tests.
• Manual tests have been provided optionally.
• The documentation for the functionality I've been working on is up-to-date.

[tochilinak]

There is a small issue about one error message, everything else is fine.