Rename mock strategy options in gradle and maven plugins

[mmvpm]

Description

Renamed unclear option names of the parameter mockStrategy in the Gradle/Maven plugins.
Fixes #367

Type of Change

• Minor bug fix (non-breaking small changes)

How Has This Been Tested?

Automated Testing

org.utbot.gradle.plugin

Manual Scenario

Run tests generation using Gradle/Maven plugin and specify the parameter mockStrategy.

Checklist:

• The change followed the style guidelines of the UTBot project
• Self-review of the code is passed
• The change contains enough commentaries, particularly in hard-to-understand areas
• New documentation is provided or existed one is altered
• No new warnings
• All tests pass locally with my changes