Add keywords to pbjsConfig if user is in the prebidKeywords test

[emma-imber]

What does this change?

Adds page keywords to the Prebid config following the docs here.

The change has been added behind a 50% test so that we can measure any impact this may have on revenue. I've offset the test to make sure that it doesn't overlap with the RegionSpecificPrebid test.

Why?

We want to try adding keywords to our Prebid config to help make sure programmatic ads can target our pages properly. Our current implementation for adding keywords for Magnite is out of date for our current Prebid version, so we need to update how we do this.

Once the test is complete, if we want to go ahead with adding keywords this way, we can remove the current keyword implementation for Magnite.

Screenshots

Not in the test

In the test

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Latest commit: 7fef6c3

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From guardian/actions-riff-raff.

[github-actions]

Ad load time test results

For consented, top-above-nav took on average 4364ms to load.
For consentless, top-above-nav took on average 2907ms to load.

Test conditions:

• 5mbps download speed
• 1.5mbps upload speed
• 150ms latency

[prout-bot]

Seen on PROD (merged by @emma-imber 3 minutes and 22 seconds ago) Please check your changes!