This fixes failures such as the following when a spawn, e.g. a reduced Java compilation spawn, doesn't create an optional output:

```
java.io.FileNotFoundException: /private/var/tmp/_bazel_fmeum/507738cfc7e6cde00e4a0230e9aa0722/execroot/_main/bazel-out/_tmp/actions/remote/175.tmp (No such file or directory)
	at com.google.devtools.build.lib.unix.NativePosixFiles.lstat(Native Method)
	at com.google.devtools.build.lib.unix.UnixFileSystem.statInternal(UnixFileSystem.java:212)
	at com.google.devtools.build.lib.unix.UnixFileSystem.stat(UnixFileSystem.java:201)
	at com.google.devtools.build.lib.vfs.Path.stat(Path.java:290)
	at com.google.devtools.build.lib.vfs.FileSystemUtils.moveFile(FileSystemUtils.java:456)
	at com.google.devtools.build.lib.remote.RemoteExecutionService.moveOutputsToFinalLocation(RemoteExecutionService.java:878)
        ...
```

Also clean up temporary files in case of an exception.

Work towards bazelbuild#23288

Closes bazelbuild#23296.

PiperOrigin-RevId: 665744936
Change-Id: I89a409c7a6b28b2a5fa532bdb233dca9bc5bde73

When an action may modify a spawn's outputs after execution, the upload of outputs to the cache and reuse for deduplicated actions need to happen synchronously directly after spawn execution to avoid a race.

This commit implements this for cache uploads by marking all actions with this property and simply disabling async upload for all spawns executed by such actions.

For output reuse, all executions deduplicated against the first one register atomically upon deduplication and cause the cache upload to wait for all of them to complete reuse.

Fixes bazelbuild#22501
Fixes bazelbuild#23288
Work towards bazelbuild#21578
Closes bazelbuild#23307 (no longer needed)

Closes bazelbuild#23382.

PiperOrigin-RevId: 668101364
Change-Id: Ice75dbe14a7dd46e02ecb096d2b2a30940216356