Add more properties to the Secure scan snowplow tracking event

What does this MR do?

Adds the Analyzer ID (e.g. gitlab-dast) as the event label and the Scan type (e.g. dast/sast/etc) as the event property to the Snowplow event that is tracked whenever a Secure scan is executed.

While this data is already captured as part of the context, adding as label and property allows for filtering on these values in Sisense SQL queries as the context cannot be queried directly.

Does this MR meet the acceptance criteria?

Conformity

• I have included changelog trailers, or none are needed. (Does this MR need a changelog?)
• I have added/updated documentation, or it's not needed. (Is documentation required?)
• I have properly separated EE content from FOSS, or this MR is FOSS only. (Where should EE code go?)
• I have added information for database reviewers in the MR description, or it's not needed. (Does this MR have database related changes?)
• I have self-reviewed this MR per code review guidelines.
• This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)
• I have followed the style guides.
• This change is backwards compatible across updates, or this does not apply.

Availability and Testing

• I have added/updated tests following the Testing Guide, or it's not needed. (Consider all test levels. See the Test Planning Process.)
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• I have informed the Infrastructure department of a default or new setting change per definition of done, or it's not needed.