FindVulkan: Restore tolerance of unknown FATAL_ERROR component

find_package(Vulkan REQUIRED FATAL_ERROR) calls exist in the wild, but find_package does not have a FATAL_ERROR option. We silently tolerated such calls prior to !7225 (merged), by treating the argument as a component and ignoring it. Restore tolerance by removing the component and warning about it.

Fixes: #23849 (closed)
Backport: release

changed milestone to %3.24.1

added triage:regression workflow:in-review labels

assigned to @brad.king

Warnings:

• Eligible for the 3.24.x branch.

The warnings do not need to be fixed, but it is recommended to do so.

mentioned in issue #23849 (closed)

Do: stage

added workflow:nightly-testing label and removed workflow:in-review label

Do: merge

merged

mentioned in commit 8ad94b19

mentioned in commit bc7dca34

removed workflow:nightly-testing label