Disable webp option when any webp plugin serves webp generation

[engahmeds3ed]

Description

This is a regression found by @Mai-Saad so we need to make sure that we disable webp option when any supported webp plugin is serving webp images like Imagify.

@wp-media/productrocket I don't know if we need to handle the following case also here or not:

1. Deactivate Imagify
2. Enable Webp option in WPR
3. Enable Imagify
4. The option is disabled but in ON mode

I think this should be in OFF mode, what do u think?

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Locally

Checklist:

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• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes

[Mai-Saad]

Working as expected with the following note:

• if WPR Addon was on , before serving WebP from the compatibility plugin, once serving WebP from the other plugin, our Addon will be off and dimmed, If we disabled the other plugin or stopped serving WebP there, our Addon will be enabled and Off. (already on trunk)
  testrail-report-452.pdf