Revert "[resultdb] Add create-root-luci-secret.sh"
Revert "[resultdb] Add create-root-luci-secret.sh"

This reverts commit 88a446ceea8f5d5515232cd0e4ca34c26f110a22.

Reason for revert: no longer necessary

Original change's description:
> [resultdb] Add create-root-luci-secret.sh
> 
> It creates a "root-luci-secret" k8s secret.
> 
> R=​vadimsh@chromium.org
> 
> Change-Id: If4242bcc56bc5a1ec17c3235bd2505f2a5092aec
> Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/1893646
> Commit-Queue: Vadim Shtayura <vadimsh@chromium.org>
> Reviewed-by: Vadim Shtayura <vadimsh@chromium.org>
> Auto-Submit: Nodir Turakulov <ef4933a197ef7b4b3f55f1bec4942aead3637a2a@chromium.org>

TBR=vadimsh@chromium.org,ef4933a197ef7b4b3f55f1bec4942aead3637a2a@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: Id0701c04e8e5716daae7cc8d18e670bdabba42d7
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/1896457
Reviewed-by: Nodir Turakulov <ef4933a197ef7b4b3f55f1bec4942aead3637a2a@chromium.org>
Commit-Queue: Nodir Turakulov <ef4933a197ef7b4b3f55f1bec4942aead3637a2a@chromium.org>

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go