Add experimental_drop_fully_static_linking_mode

When this option is set to true, then bazel will not scan linkopts for -static
and will therefore never set linking mode to fully_static. This option will be
used to flip the switch once the world is migrated away from fully static
linking mode.

RELNOTES: C++: Introduced --experimental_drop_fully_static_linking_mode

Fully static linking mode will be removed soon. This option allows you to test
if your build will be passing.

Strategy for migrating away from fully static linking mode is to define a
crosstool feature named `fully_static_link`, enable it from the target (by
adding `features = [ "fully_static_link" ]`), and make sure the target is build
with `linkstatic = 1`. Buildozer command that will do just that is:

    buildozer 'remove linkopts -static' 'set linkstatic 1' 'add features fully_static_link' //foo:bar

PiperOrigin-RevId: 187856775

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