Code Scanning event type is too greedy

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Describe the bug
The code scanning event type definition is too greedy. The definition also captures secret scanning alerts. This causes difficulties when searching based on event types.

To Reproduce
Steps to reproduce the behavior:

1. Search for `eventtype="GitHub::SecretScanning"
2. Expand the eventtype field for any result
3. Notice that all the findings come back with both the GitHub::SecretScanning and GitHub::CodeScanning event types

Expected behavior
Any event which is a secret scanning event should only return with the event type of secret scanning

Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Additional context
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