Add feature to specify specific spec pattern for scenario class

What does this MR do and why?

Adds a feature in scenario class that allows defining specific spec pattern which would allow to run only specs matching the pattern. This is similar to using rspec tags but allows to create test scenarios that are limited to particular folders without the need to create and add separate rspec tags to all relevant specs.

Closes Add CreateStage scenario class to limit test su... (gitlab-org/quality/analytics/team#22 - closed)

References

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• [E2E] Build capability to dynamically scale amo... (gitlab-org/quality/analytics/team#2 - closed)

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