Fix Workaround (WA1) and properly encode/decode drmFormatModifierCount

The goal is to remove WA1 from the spec while asynchronously updating the driver/renderer to avoid any production breakage.

The steps are as follows (I'll update status/links as MRs for each step are created):

Step 1:
Simultaneously update generator and headers to encode/decode count for VkDrmFormatModifierPropertiesList2EXT:

• venus-protocol: https://gitlab.freedesktop.org/olv/venus-protocol/-/merge_requests/59
• virglrenderer: virglrenderer!1039 (merged)
  • Also redirect VkDrmFormatModifierPropertiesList2EXT to original variant when submitting to native driver.
• mesa: mesa/mesa!21323 (merged)

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Step 2:
Update to redirect original variant to VkDrmFormatModifierPropertiesList2EXT before encoding (to temp. disable encode of original variant).

• mesa: mesa/mesa!21367 (merged)

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Step 3: Update generator and renderer headers to properly decode count in original variant.

• venus-protocol: https://gitlab.freedesktop.org/olv/venus-protocol/-/merge_requests/61
• virglrenderer: virglrenderer!1041 (merged)

Step 3.5:

• Update Mesa CI's pinned virglrenderer: mesa/mesa!21496 (merged)
• Update Virglrenderer CI's pinned mesa: virglrenderer!1044 (merged)

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Step 4:
Remove the redirection from step 2, and additionally uprev the generated headers from the venus-protocol update in step 3.

• mesa: mesa/mesa!21395 (merged)

Step 4.5:

• Update Virglrenderer CI's pinned mesa: Already covered by virglrenderer!1052 (merged), which includes mesa/mesa!21395 (merged)

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Step 5: Remove the redirection from step 1:

• virglrenderer: virglrenderer!1042 (merged)

Step 5.5:

• Update Mesa CI's pinned virglrenderer: mesa/mesa!21794 (merged)

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Tests performed at each "step":

• crosvm+Linux VM: vkcube/Hollow Knight in Linux VM under Crosvm
• vtest: sample program that calls vkGetPhysicalDeviceFormatProperties2() with either VkDrmFormatPropertiesListEXT or VkDrmFormatPropertiesList2EXT (not both). Checked output.
• crosvm+Linux VM: dEQP-VK.drm_format_modifiers.* compare with native results and vtest results before any changes.