airstore: remove getdeps manifest, getdeps sandcastle integration

[codyohl]

Summary: X-link: https://github.com/facebookexperimental/rust-shed/pull/54

X-link: https://github.com/facebookincubator/hsthrift/pull/132

X-link: https://github.com/facebookincubator/zstrong/pull/846

takes AIRStore off of getdeps!

• remove our manifest file
• remove our native-getdeps sandcastle integration

Differential Revision: D57985865