Add "Using Trusted Artifacts"

[lcarva]

Ref: EC-661

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[arewm]

Can we add a section in https://konflux-ci.dev/docs/how-tos/configuring/customizing-the-build/#extending-the-build-pipeline-with-your-own-tasks for extending tasks leveraging OCI-TA as well?

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[lcarva]

Can we add a section in https://konflux-ci.dev/docs/how-tos/configuring/customizing-the-build/#extending-the-build-pipeline-with-your-own-tasks for extending tasks leveraging OCI-TA as well?

The section after that needs some attention. Even without Trusted Artifacts, we shouldn't be guiding users toward just excluding trusted_task.trusted without warning them of the repercussions.

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