Camelize keys of Snowplow Micro options object

What does this MR do and why?

When initializing Snowplow Micro in the frontend, forceSecureTracker should bet set to false so the event request protocol used is http. However, Gitlab::Tracking::Destinations::SnowplowMicro#options currently returns force_secure_tracker (snake_case) instead of forceSecureTracker (camelCase) so forceSecureTracker default option in the frontend is not overriden correctly when Snowplow tracker is initialized.

This MR updates Gitlab::Tracking::Destinations::SnowplowMicro#options to transform the returned object keys to camel case in order to fix the aforementioned problem.

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