fix: fix infinite loop in workflow tool with duplicate task names

[dominikschweigl]

Description

This PR instantiates a new TaskExecutor after each workflow execution.

This is needed to avoid infinite loop on consecutive workflow executions with workflows containing tasks with the same names.

Related Issues

#244

Documentation PR

Type of Change

Bug fix

Testing

How have you tested the change? Verify that the changes do not break functionality or introduce warnings in consuming repositories: agents-docs, agents-tools, agents-cli

• [x ] I ran hatch run prepare

Checklist

• [x ] I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature
• [x ] My changes generate no new warnings
• [x ] Any dependent changes have been merged and published

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