test: added tests for recent bugs 2

[pkaramon]

Summary

• added tests for RPs: 410, 257, 306, 284, 450
• added handling of android-only and ios-only tags, so that we can write tests which will be only executed on the specified platform

Test Plan

• execute new tests, see if they pass

yarn test:e2e .maestro/flows/checkbox_toggle.yaml .maestro/flows/codeblock_no_link_detection.yaml .maestro/flows/conflicting_paragraph_merge.yaml .maestro/flows/empty_element_parsing.yaml                                     .maestro/flows/paragraph_styles_no_crash.yaml

Screenshots / Videos

N/A

Compatibility

OS	Implemented
iOS	✅
Android	✅

[exploIF]

🚀