Fixes #5682 - Handle Lifecycle env read perms better

1) Made env index call prune the return list based on read perms
2) Made the env page in the UI display paths appropriately based on read
perms
3) Updated the create env call to require read access on the prior
environment before one can create.
Merge pull request #4102 from parthaa/env-read

Fixes #5682 - Handle Lifecycle env read perms better