build: convert prerender gulp task to bazel

[devversion]

Since 57e31da landed a few days ago, we can finally convert the prerender gulp task to Bazel and also verify that tsickle runs properly.

[josephperrott]

Do we need to do any verification before that we are able to build it?

[jelbourn]

LGTM

[ngbot]

I see that you just added the pr: merge ready label, but the following checks are still failing:
     status "ci/circleci: bazel_build" is failing
     status "ci/circleci: ivy_test" is failing
     status "ci/circleci: tests_browserstack" is failing
     status "ci/circleci: tests_local_browsers" is failing
     status "ci/circleci: tests_saucelabs" is failing

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If you can't get the PR to a green state due to flakes or broken master, please try rebasing to master and/or restarting the CI job. If that fails and you believe that the issue is not due to your change, please contact the caretaker and ask for help.

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