Wrong "Running" value in terminal UI

[sluongng]

> buck2 build -c build.threads=2 //...
Build ID: 0066ddac-5227-49b1-803b-7342c428db71
Command: build.                                                        Jobs: Running: 2.0 K. Progress: 8.1 K/12 K. Cache hits: 0%. Time elapsed: 25.1s
------------------------------------------------------------------------------------------------------------------------------------------------------
root//:x_250 -- action (genrule) [local_execute 1.6s]                                                                                            24.2s
root//:x_291 -- action (genrule) [local_execute 1.6s]                                                                                            24.2s
root//:x_301 -- action (genrule) [local_queued]                                                                                                  24.2s
root//:x_294 -- action (genrule) [local_queued]                                                                                                  24.2s
root//:x_289 -- action (genrule) [local_queued]                                                                                                  24.2s
root//:x_253 -- action (genrule) [local_queued]                                                                                                  24.2s
root//:x_260 -- action (genrule) [local_queued]                                                                                                  24.2s
root//:x_264 -- action (genrule) [local_queued]                                                                                                  24.2s
root//:x_26 -- action (genrule) [local_queued]                                                                                                   24.2s
root//:x_278 -- action (genrule) [local_queued]                                                                                                  24.2s
root//:y_650 -- action (genrule) [local_queued]                                                                                                  24.2s
root//:x_279 -- action (genrule) [local_queued]                                                                                                  24.2s
root//:x_283 -- action (genrule) [local_queued]                                                                                                  24.2s
root//:x_29 -- action (genrule) [local_queued]                                                                                                   24.2s
root//:x_165 -- action (genrule) [local_queued]                                                                                                  24.2s
root//:x_3 -- action (genrule) [local_queued]                                                                                                    24.2s
root//:y_78 -- action (genrule) [local_queued]                                                                                                   24.2s
root//:x_246 -- action (genrule) [local_queued]                                                                                                  24.2s
root//:x_272 -- action (genrule) [local_queued]                                                                                                  24.2s
... and 3964 more

Even when we limit threads to a very small amount (2 like the command above), the terminal UI was still reporting Jobs: Running: 2.0 K., which is wrong.

This should be fixed to Jobs: Scheduled: 2.0 K. Running: 2 instead.

This could also be applied to RBE where scheduling and executing could be 2 separate statuses.

[krallin]

Ah, "Jobs" there doesn't actually mean "commands" (look at analysis earlier in the build for example, that counts as running, the same is true of the progress counter).

We can probably rename this to something else, e.g. "Active"?