set $GRPC_PYTHON_BUILD_EXT_COMPILER_JOBS for installing grcpio extension included with TensorFlow 2.2.3-2.4.1 with 2020* toolchain

[boegel]

(created using eb --new-pr)
see #11872

[boegel]

@boegelbot please test @ generoso
CORE_CNT=16

[boegelbot]

@boegel: Request for testing this PR well received on login1

PR test command 'EB_PR=14729 EB_ARGS= /opt/software/slurm/bin/sbatch --job-name test_PR_14729 --ntasks="16" ~/boegelbot/eb_from_pr_upload_generoso.sh' executed!

• exit code: 0
• output:

Submitted batch job 7721

Test results coming soon (I hope)...

Details

- notification for comment with ID 1013676118 processed

Message to humans: this is just bookkeeping information for me,
it is of no use to you (unless you think I have a bug, which I don't).

[boegelbot]

Test report by @boegelbot
SUCCESS
Build succeeded for 5 out of 5 (5 easyconfigs in total)
cnx1 - Linux rocky linux 8.4, x86_64, Intel(R) Xeon(R) CPU E5-2690 v3 @ 2.60GHz (haswell), Python 3.6.8
See https://gist.github.com/f668df3c7eb43971a6de73abb8ba1c08 for a full test report.

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 5 out of 5 (5 easyconfigs in total)
node3502.doduo.os - Linux RHEL 8.2, x86_64, AMD EPYC 7552 48-Core Processor (zen2), Python 3.6.8
See https://gist.github.com/c26819ccb6101f1b2d17b45d66e47529 for a full test report.

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 5 out of 5 (5 easyconfigs in total)
node2643.swalot.os - Linux centos linux 7.9.2009, x86_64, Intel(R) Xeon(R) CPU E5-2660 v3 @ 2.60GHz (haswell), Python 3.6.8
See https://gist.github.com/45431e26414746ee9a75aef4d382d3a1 for a full test report.

[akesandgren]

LGTM

[akesandgren]

Going in, thanks @boegel!