Added mark_externally_initialized to texture

[R-Cramer4]

Connections
PR for #10009

Description
With #9361, textures are forced to be cleared when they aren't written to. An issue occurs when a texture was written to externally and not through wgpu. This results in a clear always being applied. Creating a texture with create_texture_from_hal works, but the problem is with textures from surfaces.

Testing
A test was added to test the new function.

Squash or Rebase?
Squash

Checklist

• I self-reviewed and fully understand this PR.
• WebGPU implementations built with wgpu may be affected behaviorally.
• Validation and feature gates are in place to confine behavioral changes.
• Tests demonstrate the validation and altered logic works.
• CHANGELOG.md entries for the user-facing effects of this change are present.
• The PR is minimal, and doesn't make sense to land as multiple PRs.
• Commits are logically scoped and individually reviewable.
• The PR description has enough context to understand the motivation and solution implemented.