feat: Warn users if Agent is called with only system messages

[sjrl]

Related Issues

• fixes Update Agent to warn the user if an empty message list is passed #9440

Proposed Changes:

Logs a warning message to users if only system messages are passed to the Agent at runtime causing potentially unexpected behavior.

How did you test it?

Added unit tests

Notes for the reviewer

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test: and added ! in case the PR includes breaking changes.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[coveralls]

Pull Request Test Coverage Report for Build 15634478084

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 13 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.03%) to 90.284%

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Files with Coverage Reduction	New Missed Lines	%
components/agents/agent.py	13	90.7%

Totals
Change from base Build 15634468219:	0.03%
Covered Lines:	11560
Relevant Lines:	12804

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💛 - Coveralls