Disable pylint warning for unused argument

[mrm9084]

Add pylint disable comment for unused argument in on_start method.

Description

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• The pull request does not introduce [breaking changes]
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[Copilot]

Pull Request Overview

This PR adds a pylint disable comment to suppress the unused-argument warning for the parent_context parameter in the on_start method of what appears to be a telemetry span processor class.

• Added pylint directive to suppress unused-argument warning for parent_context parameter

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