Revert "[JENKINS-71849] Allow NoThrottle to be used even on github.…

[car-roll]

…com (#653)"

This reverts commit 51d5810.

Description

Reverting #653 due to concerns of GitHub policies explained here: #653 (comment)

Issue experienced in JENKINS-71849 still exist and need continued investigation as to why ThrottleOnOver is not behaving as expected.

Submitter checklist

• Link to JIRA ticket in description, if appropriate.
• Change is code complete and matches issue description
• Automated tests have been added to exercise the changes
• Reviewer's manual test instructions provided in PR description. See Reviewer's first task below.

Reviewer checklist

• Run the changes and verify that the change matches the issue description
• Reviewed the code
• Verified that the appropriate tests have been written or valid explanation given

Documentation changes

• Link to jenkins.io PR, or an explanation for why no doc changes are needed

Users/aliases to notify