control gherkin prefixes for secondary steps

[SonOfSardaar]

Configurator.StepTitleFactory.AddGherkinPrefixToSecondarySteps flag now controls if secondary step titles should have gherkin prefixes. eg. below

When Enabled:

Given some setup
    And some config
When some action
   And another action
Then something happens
   And another thing happens

When Disabled:

Given some setup
    some config
When some action
   another action
Then something happens
   another thing happens

[asos-gurpreetsingh]

@copilot review this PR