Remove "sweep" or "sweep: " from issue title

[sweep-nightly]

This PR addresses the issue of removing "sweep" or "sweep: " from the issue title if it exists. The changes are made in the on_ticket.py file where the issue title is processed.

A check has been added to remove "sweep" or "sweep: " from the issue title during the processing of "issues labeled" event. This ensures that the issue title is correctly formatted without any unnecessary prefixes.

Please review and provide feedback.

Fixes #24.

[sweep-nightly]

Hi there, good job on your work so far! I noticed a small issue that needs to be addressed:

• In src/handlers/on_ticket.py, there's a misplaced code block in the function definition causing a syntax error. The block of code that modifies the title variable should be inside the function body, not in the function definition. Please move the following code block to the correct place:

title = title.replace('sweep: ', '').replace('sweep ', '') if title.lower().startswith(('sweep: ', 'sweep ')) else title

Keep up the good work!