Replace hardcoded value 200f by agentRotationSpeed

[montplaisir]

Proposed change(s)

In Examples, replace hardcoded value 200f by agentRotationSpeed

Useful links (Github issues, JIRA tickets, ML-Agents forum threads etc.)

Issue: #5850
Integration of #5851

Co-authored-by: @hughperkins

Types of change(s)

• Bug fix
• New feature
• Code refactor
• Breaking change
• Documentation update
• Other (please describe)

Checklist

• Added tests that prove my fix is effective or that my feature works
• Updated the changelog (if applicable)
• Updated the documentation (if applicable)
• Updated the migration guide (if applicable)

[u-pr]

Clean refactor to replace hardcoded values with consistent variables.

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