Enable strict validation of Gradle tasks

[3flex]

Is your feature request related to a problem? Please describe.
Gradle tasks should declare all necessary annotations so Gradle can make better decisions about caching tasks or treating them as UP-TO-DATE. This means faster build times overall as less unnecessary work must be done.

Describe the solution you'd like
Use Gradle's built in strict plugin validation feature to ensure annotations are added correctly.

Describe alternatives you've considered
None

Additional context