Replace stub/virtualize usage with mock

[nashjain]

Summary

• replace remaining Specmatic command usage of \ and \ with \
• update test-container startup checks to match mock server logs where applicable

Validation

• searched codebase for remaining command-form usage of \Using bleeding edge Specmatic build

Error: No jar file found matching pattern: /Users/naresh/projects/specmatic-all/specmatic/application/build/libs/specmatic*-all-un*.jar and \