x/tools/gopls/internal/regtest: TestDeleteModule_Interdependent flakes due to orphaned file reloading

[findleyr]

Looking at regtest failures for issue #46183, one common source of flakes in slower builders is TestDeleteModule_Interdependent in golang.org/x/tools/gopls/internal/regtest/workspace.

For example:
https://build.golang.org/log/c962f4fbb5df4c74ebe76f8aeb610eed3065f267
https://storage.googleapis.com/go-build-log/8b462d75/freebsd-amd64-12_2_e126050b.log

This test failure appears to be a race related to orphaned file reloading. All failures have a log message about reloadOrphanedFiles, but when it succeeds locally I never see this log message.

Since it is an experimental feature, we should disable this test until we understand it.

CC @stamblerre @heschi

[gopherbot]

Change https://golang.org/cl/322649 mentions this issue: gopls/internal/regtest: skip TestDeleteModule_Interdependent