BUG: Let ReadImageInformation succeed for unconfigured codecs

[blowekamp]

Backport of #6904 (c037e7e) to release-5.4. Closes #6902.

AI assistance

• Tool: Claude Code
• Role: performed the cherry-pick, verified a clean apply against release-5.4, built the ITKIOTIFF module and ran its test suite (64/64 passed) before pushing
• All code is identical to the reviewed main-branch commit; no manual changes were needed

[blowekamp]

@dzenanz These dashboard failures: https://open.cdash.org/builds/11582294/tests?filters=%7B%22all%22%3A%5B%7B%22eq%22%3A%7B%22status%22%3A%22FAILED%22%7D%7D%5D%7D appear to be cause by "out of disk space" rather than this recent commit to main.

[greptile-apps]

Confidence Score: 4/5

[Medium risk] Changes when TIFF codec errors are reported during image reading.

The PR appears safe to merge, with a non-blocking gap in regression coverage for unavailable codecs.

Findings

1.  Missing codec regression coverage ▶

Summary

The PR lets TIFF metadata inspection succeed when the file’s codec is unavailable, while moving the codec failure to pixel reading.

• Preserves metadata access without promising pixel decoding.
• Adds a decode-time error for named and unknown codecs.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  A[TIFF file] --> B[ReadImageInformation]
  B --> C[Tag-derived metadata]
  C --> D[Read pixels]
  D --> E{Codec configured?}
  E -->|No| F[Codec exception]
  E -->|Yes| G[Decode pixels]

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