Fix: changing the datatype of istio.injection

Package Merge Request

Package Changes

Fix: change the datatype of istio.injection to be a string and follow standards for utilization through "eanbled/disable" values.

For Issue

This is a package change required to address bigbang#913

BigBang Chart Draft MR has been opened to consume these updates when the new tag is released.

BIgBang Chart Draft MR passing pipeline

Testing

Tested deployment and upgrades to confirm that the injection responded correctly based on the values propagated.