When the context is larger then the context_token_length warn the user

[codelion]

In the get_source_code_context method in the ExtractCode.py file. If the context is larger than the context_token_length we just return None, None as position (as seen here - https://github.com/patched-codes/patchwork/blob/f1b107ab86c70a246691fc3062d561dd098a75ff/patchwork/steps/ExtractCode/ExtractCode.py#L32).

As a result the patchflow may fail to execute and the only the user sees is No context found. Instead we should warn them with a logger.warn and suggest that the context selected is larger than the context_token_length and they can increase the context_token_length to process the larger context.

[patched-admin]

The following files in the repository may be relevant to the issue:

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• patchwork/steps/ExtractCodeMethodForCommentContexts/ExtractCodeMethodForCommentContexts.py
• patchwork/steps/ExtractCodeContexts/ExtractCodeContexts.py
• patchwork/common/context_strategy/generic.py
• patchwork/steps/ExtractCode/ExtractCode.py
• patchwork/common/client/patched.py
• patchwork/app.py
• patchwork/steps/CreateIssueComment/CreateIssueComment.py