Fix OrTerminationCondition to raise TerminatedException instead of RuntimeError

[Nepomuk5665]

Summary

• Fix OrTerminationCondition to raise TerminatedException instead of RuntimeError when the termination condition has already been reached
• Standardize error message format by removing trailing period from AndTerminationCondition

Problem

OrTerminationCondition.__call__ was raising RuntimeError when called after the condition was already terminated:

# OrTerminationCondition (line 158) - BEFORE
raise RuntimeError("Termination condition has already been reached")

However, AndTerminationCondition and all other termination conditions in _terminations.py raise TerminatedException:

# AndTerminationCondition (line 107)
raise TerminatedException("Termination condition has already been reached.")

# All conditions in _terminations.py (e.g., MaxMessageTermination, TextMentionTermination, etc.)
raise TerminatedException("Termination condition has already been reached")

Solution

1. Changed OrTerminationCondition to raise TerminatedException instead of RuntimeError
2. Removed trailing period from AndTerminationCondition error message to match the convention used in all other termination conditions

This ensures consistent exception handling across all termination condition implementations.

Testing

The existing test test_or_termination passes. The fix aligns OrTerminationCondition with the expected behavior documented in TerminationCondition.__call__ docstring which states:

Raises:
TerminatedException: If the termination condition has already been reached.