Moves `--config=evg` to `bazel_args`, making the order in which it is added to the bazel invocation consistent between tasks.

There are 4 unique expansions to configure bazel flags in our YAML config. In the order added to the bazel test/build command, they are:
`${bazel_args} ${bazel_compile_flags} ${task_compile_flags} ${patch_compile_flags}`

Some of our `--config`s have conflicting options, and the last one in the command wins. This brings consistency immediately, while we should re-consider this stacking configuration as it is quite error-prone.