Autogenerate some extra_options based on some build properties

If an Android.bp specifies Isolated=true, make sure
it's tagged as not-shardable, since b/126376458 is not
resolved.

Test: make bionic-benchmarks-tests (with and without isolated=true)
Bug: 124024827
Change-Id: I2210c15b84f9b30e1cc23b426d463b34cf9ef94f