Add 3DGS render depth certification plan #485

Job	Run time
Pass MSRV values to other jobs	3s
clippy/1.95.0	39s
tier4-avx512-check	29s
format/stable	20s
nostd/thumbv6m-none-eabi/stable	26s
docs/nightly	49s
hpc-stream-parallel/rayon	1m 20s
native-backend/stable	6m 43s
nightly-simd-polyfill	43s
cargo-careful	41s
miri	1m 1s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
blas-msrv	45s
tests/stable	11m 10s
tests/beta	10m 41s
tests/1.95.0	11m 10s
conclusion	0s
	47m 0s

Provide feedback