Address S3906: Event Handlers should have the correct signature

[bart-vmware]

Address existing violations of S3906: Event Handlers should have the correct signature in the codebase and set severity to Warning in Steeltoe.Debug.ruleset and Steeltoe.Release.ruleset.

To find existing violations, enable the rule (see above) and rebuild src/Steeltoe.All.sln to make them appear in the Output window.

To address the violations, choose from the following on a case-by-case basis:

• Rename the existing type or wrap it
• ~Suppress the violation in code using #pragma warning disable/restore, preceded by a justification comment if not obvious~