3.16 - Remove console.log of the beacon script when the debug mode is not enabled

[MathieuLamiot]

Context
To build the feature and test the beacon script, we relied a lot on console.log() in the beacon implementation to track what was going on there. This can be very valuable for debugging later on and investigations. However, this should not happen for "normal" usage.

Expected behavior
When the script has injected from the WP Rocket plugin while DEBUG mode was off, the beacon script should not output any log.
When the script has injected from the WP Rocket plugin while DEBUG mode was on, the beacon script should output logs.

Acceptance Criteria

• Enable debug mode (WP_ROCKET_DEBUG = true).
• Clear the critical images and cache ; enable LCP/ATF.
• Browse to a page on the website, and check the dev tools: logs from the beacon script should be output in the console.
• Disable debug mode (WP_ROCKET_DEBUG = true).
• Clear the critical images and cache ; enable LCP/ATF.
• Browse to a page on the website, and check the dev tools: no logs from the beacon script should be in the console.

Additional information

• Maybe we could pass the value of the debug mode to the script when injecting it? The same way we do with a few configurations already. And use this as a condition around our console.log?
• With this solution, when the beacon is injected while on DEbug mode, then deactivate debug mode, the beacon will still output logs as it can be cached in a page. That's acceptable I think.

[remyperona]

Scope a solution ✅

⚠️ This needs to be done once we have finalized the refactors of the script.

Engine\Media\AboveTheFold\Frontend\Controller

• in inject_beacon(), add a new key to the $data, with the key debug and value of WP_ROCKET_DEBUG
• update related tests

assets/js/lcp-beacon.js

• in places where we currently have console calls, wrap them in condition checking for rocket_lcp_data.debug

Estimate the effort ✅

Effort [S]

[Miraeld]

Looks good to me

[MathieuLamiot]

Still pending this PR to be merged: #6555, #6557