Increase the timeout for worker removal under rr (#59214)

rr can make things slower, particularly under load. We saw the removal
timeout in
https://buildkite.com/julialang/julia-master-scheduled/builds/1228/steps/canvas?sid=0198793f-b191-4207-8793-a347afd2f71f
but I can't see a great rason why that happened, so let's bump the
timeout to 5 minute to give it plenty of time to exit properly.

Author: Keno

test/runtests.jl

@@ -25,6 +25,8 @@ else
     global running_under_rr() = false
 end
 
+const rmwait_timeout = running_under_rr() ? 300 : 30
+
 if use_revise
     # First put this at the top of the DEPOT PATH to install revise if necessary.
     # Once it's loaded, we swizzle it to the end, to avoid confusing any tests.
@@ -278,7 +280,7 @@ cd(@__DIR__) do
                             elseif n > 1
                                 # the worker encountered some failure, recycle it
                                 # so future tests get a fresh environment
-                                rmprocs(wrkr, waitfor=30)
+                                rmprocs(wrkr, waitfor=rmwait_timeout)
                                 p = addprocs_with_testenv(1)[1]
                                 remotecall_fetch(include, p, "testdefs.jl")
                                 if use_revise
@@ -291,7 +293,7 @@ cd(@__DIR__) do
                                 # the worker has reached the max-rss limit, recycle it
                                 # so future tests start with a smaller working set
                                 if n > 1
-                                    rmprocs(wrkr, waitfor=30)
+                                    rmprocs(wrkr, waitfor=rmwait_timeout)
                                     p = addprocs_with_testenv(1)[1]
                                     remotecall_fetch(include, p, "testdefs.jl")
                                     if use_revise
@@ -305,7 +307,7 @@ cd(@__DIR__) do
                     end
                     if p != 1
                         # Free up memory =)
-                        rmprocs(p, waitfor=30)
+                        rmprocs(p, waitfor=rmwait_timeout)
                     end
                 end
             end