Change "Overwriting property" to "Skipping property"

[tlinkowski]

Currently, we're overwriting a custom property with a shared property in:

• tlinkowski-superpom/gradle/shared-gradle-properties.gradle.kts

  Line 34 in b5c063b

  logger.warn("Overwriting property: {}", name)

• tlinkowski-superpom/subprojects/pl.tlinkowski.gradle.my.superpom/src/main/kotlin/pl/tlinkowski/gradle/my/superpom/internal/plugin/SuperpomSharedGradlePropertyImportPlugin.kt

  Line 45 in d9dd9d0

  logger.warn("Overwriting property: {}", name)

Instead, we should warn about ignoring a property overwrite (providing the ignored value, and the preserved value of the property).