Remove `devops_adoption` and `thing` feature flag stub
What does this MR do and why?
As part of the effort to only have stubbing for valid flags #378182
Here we disable the liscened feature for :devops_adoption
and remove :thing
flag stubbing.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Allison Browne