Reland "Reland "task_runner: enable go isolated client""

This is a reland of 02d93c43b05ed71afbeca7879b1fcedc67bef208

I confirmed that updated client does not failed due to too many open files.
android: https://chromium-swarm-dev.appspot.com/task?d=true&id=48f29858bba10010

Original change's description:
> Reland "task_runner: enable go isolated client"
>
> This is a reland of 2c071733b79e6929299b5704283c14771658e0c4
>
> I confirmed this works on linux and win.
> linux: https://chromium-swarm-dev.appspot.com/task?id=48ec118072711e10
> win:   https://chromium-swarm-dev.appspot.com/task?id=48ec164e68cbd110
>
>
> Original change's description:
> > task_runner: enable go isolated client
> >
> > Let me see what happens on dev instances.
> >
> > Bug: 932396
> > Change-Id: I636243dd350111fd2d4acbaa42f264b34ddf21d8
> > Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-py/+/1943743
> > Commit-Queue: Takuto Ikuta <[email protected]>
> > Reviewed-by: Junji Watanabe <[email protected]>
> > Reviewed-by: Yoshisato Yanagisawa <[email protected]>
>
> Bug: 932396
> Change-Id: I1a378341261f42825ed38dc752dfe254d98ded48
> Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-py/+/1946289
> Commit-Queue: Takuto Ikuta <[email protected]>
> Auto-Submit: Takuto Ikuta <[email protected]>
> Reviewed-by: Marc-Antoine Ruel <[email protected]>

Bug: 932396
Change-Id: Icf4ffab17e34807cf408790973d2cce9025aed38
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-py/+/1954826
Auto-Submit: Takuto Ikuta <[email protected]>
Reviewed-by: Junji Watanabe <[email protected]>
Commit-Queue: Junji Watanabe <[email protected]>
Cr-Mirrored-From: https://chromium.googlesource.com/infra/luci/luci-py
Cr-Mirrored-Commit: 425eb650bbed12b634ce831cb9f7798cf8ea4a2c

run_isolated.py

@@ -113,7 +113,7 @@
 # Take revision from
 # https://ci.chromium.org/p/infra-internal/g/infra-packagers/console
 ISOLATED_PACKAGE = 'infra/tools/luci/isolated/${platform}'
-ISOLATED_REVISION = 'git_revision:98a836e8b4eec64d41a6bfbadc80e5515c45a6f3'
+ISOLATED_REVISION = 'git_revision:ee185d59d9892bf235d574c88e3782c42d2873d9'
 
 # Keep synced with task_request.py
 CACHE_NAME_RE = re.compile(r'^[a-z0-9_]{1,4096}$')