fix(core): allow scenario name exact match without using regex

[bernardobridge]

Description

Addresses #2673 by allowing regex or exact match. I think this allows the maximum flexibility for the flag without breaking any existing workflows.

Pre-merge checklist

• Does this require an update to the docs? Yes (need to explain how the feature works - regex vs exact match)
• Does this require a changelog entry? Yes

[HugoImaios]

seems like the more pragmatic choice indeed ! Thanks @bernardobridge !